57721572031 has 4 divisors (see below), whose sum is σ = 57975852312. Its totient is φ = 57467291752.

The previous prime is 57721572001. The next prime is 57721572089. The reversal of 57721572031 is 13027512775.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57721572031 - 2¹³ = 57721563839 is a prime.

It is a super-2 number, since 2×57721572031² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57721572001) 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, 127139800 + ... + 127140253.

It is an arithmetic number, because the mean of its divisors is an integer number (14493963078).

Almost surely, 2^57721572031 is an apocalyptic number.

57721572031 is a deficient number, since it is larger than the sum of its proper divisors (254280281).

57721572031 is a wasteful number, since it uses less digits than its factorization.

57721572031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254280280.

The product of its (nonzero) digits is 102900, while the sum is 40.

The spelling of 57721572031 in words is "fifty-seven billion, seven hundred twenty-one million, five hundred seventy-two thousand, thirty-one".