2031521557 has 8 divisors (see below), whose sum is σ = 2203533920. Its totient is φ = 1861758000.

The previous prime is 2031521533. The next prime is 2031521567. The reversal of 2031521557 is 7551251302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031521557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031521507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560319 + ... + 563932.

It is an arithmetic number, because the mean of its divisors is an integer number (275441740).

Almost surely, 2^2031521557 is an apocalyptic number.

It is an amenable number.

2031521557 is a deficient number, since it is larger than the sum of its proper divisors (172012363).

2031521557 is a wasteful number, since it uses less digits than its factorization.

2031521557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124403.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 2031521557 is about 45072.4034970402. The cubic root of 2031521557 is about 1266.5056892918.

Adding to 2031521557 its reverse (7551251302), we get a palindrome (9582772859).

The spelling of 2031521557 in words is "two billion, thirty-one million, five hundred twenty-one thousand, five hundred fifty-seven".