25090081 has 3 divisors (see below), whose sum is σ = 25095091. Its totient is φ = 25085072.

The previous prime is 25090069. The next prime is 25090097. The reversal of 25090081 is 18009052.

The square root of 25090081 is 5009.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 11840481 + 13249600 = 3441^2 + 3640^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25090081 is a prime.

It is a super-2 number, since 2×25090081² = 1259024329173122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25090001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2505 + ... + 7513.

Almost surely, 2^25090081 is an apocalyptic number.

25090081 is the 5009-th square number.

25090081 is the 2505-th centered octagonal number.

It is an amenable number.

25090081 is a deficient number, since it is larger than the sum of its proper divisors (5010).

25090081 is an frugal number, since it uses more digits than its factorization.

25090081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10018 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The cubic root of 25090081 is about 292.7525507694.

Multiplying 25090081 by its sum of digits (25), we get a square (627252025 = 25045²).

The spelling of 25090081 in words is "twenty-five million, ninety thousand, eighty-one".