631360381 has 2 divisors, whose sum is σ = 631360382. Its totient is φ = 631360380.

The previous prime is 631360349. The next prime is 631360397. The reversal of 631360381 is 183063136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 8608356 = 24955^2 + 2934^2 .

It is a cyclic number.

It is not a de Polignac number, because 631360381 - 2⁵ = 631360349 is a prime.

It is a super-2 number, since 2×631360381² = 797231861392930322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631360181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315680190 + 315680191.

It is an arithmetic number, because the mean of its divisors is an integer number (315680191).

Almost surely, 2^631360381 is an apocalyptic number.

It is an amenable number.

631360381 is a deficient number, since it is larger than the sum of its proper divisors (1).

631360381 is an equidigital number, since it uses as much as digits as its factorization.

631360381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 631360381 is about 25126.8856207848. The cubic root of 631360381 is about 857.8784831429.

The spelling of 631360381 in words is "six hundred thirty-one million, three hundred sixty thousand, three hundred eighty-one".