866497631 has 2 divisors, whose sum is σ = 866497632. Its totient is φ = 866497630.

The previous prime is 866497609. The next prime is 866497637. The reversal of 866497631 is 136794668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866497631 is a prime.

It is a super-2 number, since 2×866497631² = 1501636289057224322, 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 866497631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866497637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433248815 + 433248816.

It is an arithmetic number, because the mean of its divisors is an integer number (433248816).

Almost surely, 2^866497631 is an apocalyptic number.

866497631 is a deficient number, since it is larger than the sum of its proper divisors (1).

866497631 is an equidigital number, since it uses as much as digits as its factorization.

866497631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 866497631 is about 29436.3318197088. The cubic root of 866497631 is about 953.3575126175.

The spelling of 866497631 in words is "eight hundred sixty-six million, four hundred ninety-seven thousand, six hundred thirty-one".