897405631 has 2 divisors, whose sum is σ = 897405632. Its totient is φ = 897405630.

The previous prime is 897405629. The next prime is 897405637. The reversal of 897405631 is 136504798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 897405631 - 2¹ = 897405629 is a prime.

It is a super-2 number, since 2×897405631² = 1610673733101016322, which contains 22 as substring.

Together with 897405629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897405637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448702815 + 448702816.

It is an arithmetic number, because the mean of its divisors is an integer number (448702816).

Almost surely, 2^897405631 is an apocalyptic number.

897405631 is a deficient number, since it is larger than the sum of its proper divisors (1).

897405631 is an equidigital number, since it uses as much as digits as its factorization.

897405631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 897405631 is about 29956.7293107909. The cubic root of 897405631 is about 964.5607748163.

The spelling of 897405631 in words is "eight hundred ninety-seven million, four hundred five thousand, six hundred thirty-one".