631439371 has 2 divisors, whose sum is σ = 631439372. Its totient is φ = 631439370.

The previous prime is 631439363. The next prime is 631439383. The reversal of 631439371 is 173934136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631439371 - 2³ = 631439363 is a prime.

It is a super-3 number, since 3×631439371³ (a number of 27 digits) contains 333 as substring.

It is equal to p_32878243 and since 631439371 and 32878243 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631439371.

It is not a weakly prime, because it can be changed into another prime (631439671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315719685 + 315719686.

It is an arithmetic number, because the mean of its divisors is an integer number (315719686).

Almost surely, 2^631439371 is an apocalyptic number.

631439371 is a deficient number, since it is larger than the sum of its proper divisors (1).

631439371 is an equidigital number, since it uses as much as digits as its factorization.

631439371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 631439371 is about 25128.4573939587. The cubic root of 631439371 is about 857.9142582710.

The spelling of 631439371 in words is "six hundred thirty-one million, four hundred thirty-nine thousand, three hundred seventy-one".