1631372947 has 2 divisors, whose sum is σ = 1631372948. Its totient is φ = 1631372946.

The previous prime is 1631372933. The next prime is 1631372969. The reversal of 1631372947 is 7492731361.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631372947 is a prime.

It is a super-2 number, since 2×1631372947² = 5322755384406929618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1631370947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815686473 + 815686474.

It is an arithmetic number, because the mean of its divisors is an integer number (815686474).

Almost surely, 2^1631372947 is an apocalyptic number.

1631372947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631372947 is an equidigital number, since it uses as much as digits as its factorization.

1631372947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 1631372947 is about 40390.2580704803. The cubic root of 1631372947 is about 1177.2022550958.

The spelling of 1631372947 in words is "one billion, six hundred thirty-one million, three hundred seventy-two thousand, nine hundred forty-seven".