81488577 has 4 divisors (see below), whose sum is σ = 108651440. Its totient is φ = 54325716.

The previous prime is 81488573. The next prime is 81488581. The reversal of 81488577 is 77588418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (81488573) and next prime (81488581).

It is not a de Polignac number, because 81488577 - 2² = 81488573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81488573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13581427 + ... + 13581432.

It is an arithmetic number, because the mean of its divisors is an integer number (27162860).

Almost surely, 2^81488577 is an apocalyptic number.

It is an amenable number.

81488577 is a deficient number, since it is larger than the sum of its proper divisors (27162863).

81488577 is a wasteful number, since it uses less digits than its factorization.

81488577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27162862.

The product of its digits is 501760, while the sum is 48.

The square root of 81488577 is about 9027.1023590076. The cubic root of 81488577 is about 433.5430660604.

The spelling of 81488577 in words is "eighty-one million, four hundred eighty-eight thousand, five hundred seventy-seven".