631263869 has 2 divisors, whose sum is σ = 631263870. Its totient is φ = 631263868.

The previous prime is 631263863. The next prime is 631263889. The reversal of 631263869 is 968362136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545923225 + 85340644 = 23365^2 + 9238^2 .

It is a cyclic number.

It is not a de Polignac number, because 631263869 - 2²⁰ = 630215293 is a prime.

It is a super-2 number, since 2×631263869² = 796988144609698322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631263863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315631934 + 315631935.

It is an arithmetic number, because the mean of its divisors is an integer number (315631935).

Almost surely, 2^631263869 is an apocalyptic number.

It is an amenable number.

631263869 is a deficient number, since it is larger than the sum of its proper divisors (1).

631263869 is an equidigital number, since it uses as much as digits as its factorization.

631263869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 631263869 is about 25124.9650547021. The cubic root of 631263869 is about 857.8347681270.

The spelling of 631263869 in words is "six hundred thirty-one million, two hundred sixty-three thousand, eight hundred sixty-nine".