631629797 has 2 divisors, whose sum is σ = 631629798. Its totient is φ = 631629796.

The previous prime is 631629737. The next prime is 631629809. The reversal of 631629797 is 797926136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485364961 + 146264836 = 22031^2 + 12094^2 .

It is a cyclic number.

It is not a de Polignac number, because 631629797 - 2¹⁴ = 631613413 is a prime.

It is a super-2 number, since 2×631629797² = 797912400916522418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631629737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315814898 + 315814899.

It is an arithmetic number, because the mean of its divisors is an integer number (315814899).

Almost surely, 2^631629797 is an apocalyptic number.

It is an amenable number.

631629797 is a deficient number, since it is larger than the sum of its proper divisors (1).

631629797 is an equidigital number, since it uses as much as digits as its factorization.

631629797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 631629797 is about 25132.2461590682. The cubic root of 631629797 is about 858.0004912852. Note that the first 3 decimals are identical.

The spelling of 631629797 in words is "six hundred thirty-one million, six hundred twenty-nine thousand, seven hundred ninety-seven".