63131691 has 16 divisors (see below), whose sum is σ = 96322304. Its totient is φ = 36029664.

The previous prime is 63131681. The next prime is 63131701. The reversal of 63131691 is 19613136.

It is an interprime number because it is at equal distance from previous prime (63131681) and next prime (63131701).

It is not a de Polignac number, because 63131691 - 2¹⁰ = 63130667 is a prime.

It is a super-2 number, since 2×63131691² = 7971220817038962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63131671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22245 + ... + 24921.

It is an arithmetic number, because the mean of its divisors is an integer number (6020144).

Almost surely, 2^63131691 is an apocalyptic number.

63131691 is a deficient number, since it is larger than the sum of its proper divisors (33190613).

63131691 is a wasteful number, since it uses less digits than its factorization.

63131691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its digits is 2916, while the sum is 30.

The square root of 63131691 is about 7945.5453557324. The cubic root of 63131691 is about 398.1827796946.

The spelling of 63131691 in words is "sixty-three million, one hundred thirty-one thousand, six hundred ninety-one".