320631887 has 2 divisors, whose sum is σ = 320631888. Its totient is φ = 320631886.

The previous prime is 320631863. The next prime is 320631911. The reversal of 320631887 is 788136023.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (320631863) and next prime (320631911).

It is a cyclic number.

It is not a de Polignac number, because 320631887 - 2²⁰ = 319583311 is a prime.

It is a super-2 number, since 2×320631887² = 205609613922361538, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320631887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320631827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160315943 + 160315944.

It is an arithmetic number, because the mean of its divisors is an integer number (160315944).

Almost surely, 2^320631887 is an apocalyptic number.

320631887 is a deficient number, since it is larger than the sum of its proper divisors (1).

320631887 is an equidigital number, since it uses as much as digits as its factorization.

320631887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 320631887 is about 17906.1968882284. The cubic root of 320631887 is about 684.4402958126.

The spelling of 320631887 in words is "three hundred twenty million, six hundred thirty-one thousand, eight hundred eighty-seven".