631919453 has 4 divisors (see below), whose sum is σ = 689366688. Its totient is φ = 574472220.

The previous prime is 631919413. The next prime is 631919471. The reversal of 631919453 is 354919136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631919453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631919453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631919413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28723601 + ... + 28723622.

It is an arithmetic number, because the mean of its divisors is an integer number (172341672).

Almost surely, 2^631919453 is an apocalyptic number.

It is an amenable number.

631919453 is a deficient number, since it is larger than the sum of its proper divisors (57447235).

631919453 is a wasteful number, since it uses less digits than its factorization.

631919453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57447234.

The product of its digits is 87480, while the sum is 41.

The square root of 631919453 is about 25138.0081350930. The cubic root of 631919453 is about 858.1316266492.

The spelling of 631919453 in words is "six hundred thirty-one million, nine hundred nineteen thousand, four hundred fifty-three".