631887461 has 2 divisors, whose sum is σ = 631887462. Its totient is φ = 631887460.

The previous prime is 631887457. The next prime is 631887481. The reversal of 631887461 is 164788136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616528900 + 15358561 = 24830^2 + 3919^2 .

It is a cyclic number.

It is not a de Polignac number, because 631887461 - 2² = 631887457 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631887481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315943730 + 315943731.

It is an arithmetic number, because the mean of its divisors is an integer number (315943731).

Almost surely, 2^631887461 is an apocalyptic number.

It is an amenable number.

631887461 is a deficient number, since it is larger than the sum of its proper divisors (1).

631887461 is an equidigital number, since it uses as much as digits as its factorization.

631887461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 631887461 is about 25137.3717997725. The cubic root of 631887461 is about 858.1171449458.

The spelling of 631887461 in words is "six hundred thirty-one million, eight hundred eighty-seven thousand, four hundred sixty-one".