631495397 has 4 divisors (see below), whose sum is σ = 680071980. Its totient is φ = 582918816.

The previous prime is 631495373. The next prime is 631495411. The reversal of 631495397 is 793594136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368601601 + 262893796 = 19199^2 + 16214^2 .

It is a cyclic number.

It is not a de Polignac number, because 631495397 - 2²⁰ = 630446821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631495367) 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 in 3 ways as a sum of consecutive naturals, for example, 24288272 + ... + 24288297.

It is an arithmetic number, because the mean of its divisors is an integer number (170017995).

Almost surely, 2^631495397 is an apocalyptic number.

It is an amenable number.

631495397 is a deficient number, since it is larger than the sum of its proper divisors (48576583).

631495397 is a wasteful number, since it uses less digits than its factorization.

631495397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48576582.

The product of its digits is 612360, while the sum is 47.

The square root of 631495397 is about 25129.5721611014. The cubic root of 631495397 is about 857.9396310331.

The spelling of 631495397 in words is "six hundred thirty-one million, four hundred ninety-five thousand, three hundred ninety-seven".