572121631 has 2 divisors, whose sum is σ = 572121632. Its totient is φ = 572121630.

The previous prime is 572121611. The next prime is 572121661. The reversal of 572121631 is 136121275.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-572121631 is a prime.

It is a super-2 number, since 2×572121631² = 654646321316200322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 572121631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (572121611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 286060815 + 286060816.

It is an arithmetic number, because the mean of its divisors is an integer number (286060816).

Almost surely, 2^572121631 is an apocalyptic number.

572121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

572121631 is an equidigital number, since it uses as much as digits as its factorization.

572121631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 572121631 is about 23919.0641748376. The cubic root of 572121631 is about 830.1618840382.

The spelling of 572121631 in words is "five hundred seventy-two million, one hundred twenty-one thousand, six hundred thirty-one".