491937631 has 2 divisors, whose sum is σ = 491937632. Its totient is φ = 491937630.

The previous prime is 491937617. The next prime is 491937659. The reversal of 491937631 is 136739194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491937631 - 2⁹ = 491937119 is a prime.

It is a super-2 number, since 2×491937631² = 484005265587784322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491937031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245968815 + 245968816.

It is an arithmetic number, because the mean of its divisors is an integer number (245968816).

Almost surely, 2^491937631 is an apocalyptic number.

491937631 is a deficient number, since it is larger than the sum of its proper divisors (1).

491937631 is an equidigital number, since it uses as much as digits as its factorization.

491937631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 491937631 is about 22179.6670624245. The cubic root of 491937631 is about 789.4113175707.

The spelling of 491937631 in words is "four hundred ninety-one million, nine hundred thirty-seven thousand, six hundred thirty-one".