631545493 has 2 divisors, whose sum is σ = 631545494. Its totient is φ = 631545492.

The previous prime is 631545487. The next prime is 631545517. The reversal of 631545493 is 394545136.

631545493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601328484 + 30217009 = 24522^2 + 5497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631545493 is a prime.

It is a super-2 number, since 2×631545493² = 797699419457226098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631545413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315772746 + 315772747.

It is an arithmetic number, because the mean of its divisors is an integer number (315772747).

Almost surely, 2^631545493 is an apocalyptic number.

It is an amenable number.

631545493 is a deficient number, since it is larger than the sum of its proper divisors (1).

631545493 is an equidigital number, since it uses as much as digits as its factorization.

631545493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 40.

The square root of 631545493 is about 25130.5688952718. The cubic root of 631545493 is about 857.9623169769.

The spelling of 631545493 in words is "six hundred thirty-one million, five hundred forty-five thousand, four hundred ninety-three".