631249667 has 2 divisors, whose sum is σ = 631249668. Its totient is φ = 631249666.

The previous prime is 631249649. The next prime is 631249669. The reversal of 631249667 is 766942136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631249667 - 2¹⁶ = 631184131 is a prime.

It is a super-2 number, since 2×631249667² = 796952284175221778, which contains 22 as substring.

Together with 631249669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631249669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315624833 + 315624834.

It is an arithmetic number, because the mean of its divisors is an integer number (315624834).

Almost surely, 2^631249667 is an apocalyptic number.

631249667 is a deficient number, since it is larger than the sum of its proper divisors (1).

631249667 is an equidigital number, since it uses as much as digits as its factorization.

631249667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 631249667 is about 25124.6824258537. The cubic root of 631249667 is about 857.8283349689.

The spelling of 631249667 in words is "six hundred thirty-one million, two hundred forty-nine thousand, six hundred sixty-seven".