81579357 has 12 divisors (see below), whose sum is σ = 120344640. Its totient is φ = 53228808.

The previous prime is 81579319. The next prime is 81579389. The reversal of 81579357 is 75397518.

It is not a de Polignac number, because 81579357 - 2⁸ = 81579101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81579307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96007 + ... + 96852.

It is an arithmetic number, because the mean of its divisors is an integer number (10028720).

Almost surely, 2^81579357 is an apocalyptic number.

It is an amenable number.

81579357 is a deficient number, since it is larger than the sum of its proper divisors (38765283).

81579357 is a wasteful number, since it uses less digits than its factorization.

81579357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192912 (or 192909 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 81579357 is about 9032.1291509810. The cubic root of 81579357 is about 433.7039983659.

The spelling of 81579357 in words is "eighty-one million, five hundred seventy-nine thousand, three hundred fifty-seven".