2581351249 has 15 divisors (see below), whose sum is σ = 2757125833. Its totient is φ = 2416584148.

The previous prime is 2581351243. The next prime is 2581351259. The reversal of 2581351249 is 9421531852.

It is a happy number.

The square root of 2581351249 is 50807.

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

2581351249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2581351249 - 2⁵ = 2581351217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581351243) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 54922344 + ... + 54922390.

Almost surely, 2^2581351249 is an apocalyptic number.

2581351249 is the 50807-th square number.

2581351249 is the 25404-th centered octagonal number.

It is an amenable number.

2581351249 is a deficient number, since it is larger than the sum of its proper divisors (175774584).

2581351249 is an frugal number, since it uses more digits than its factorization.

2581351249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 70 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The cubic root of 2581351249 is about 1371.7733706495.

The spelling of 2581351249 in words is "two billion, five hundred eighty-one million, three hundred fifty-one thousand, two hundred forty-nine".