631513389 has 8 divisors (see below), whose sum is σ = 906788512. Its totient is φ = 388623600.

The previous prime is 631513387. The next prime is 631513417. The reversal of 631513389 is 983315136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631513389 - 2¹ = 631513387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16192651 = 631513389 / (6 + 3 + 1 + 5 + 1 + 3 + 3 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631513387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8096287 + ... + 8096364.

It is an arithmetic number, because the mean of its divisors is an integer number (113348564).

Almost surely, 2^631513389 is an apocalyptic number.

It is an amenable number.

631513389 is a deficient number, since it is larger than the sum of its proper divisors (275275123).

631513389 is a wasteful number, since it uses less digits than its factorization.

631513389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16192667.

The product of its digits is 58320, while the sum is 39.

The square root of 631513389 is about 25129.9301431580. The cubic root of 631513389 is about 857.9477788376.

The spelling of 631513389 in words is "six hundred thirty-one million, five hundred thirteen thousand, three hundred eighty-nine".