631517421 has 8 divisors (see below), whose sum is σ = 886340320. Its totient is φ = 398853072.

The previous prime is 631517413. The next prime is 631517477. The reversal of 631517421 is 124715136.

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

It is not a de Polignac number, because 631517421 - 2³ = 631517413 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 (631512421) 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, 5539570 + ... + 5539683.

It is an arithmetic number, because the mean of its divisors is an integer number (110792540).

Almost surely, 2^631517421 is an apocalyptic number.

It is an amenable number.

631517421 is a deficient number, since it is larger than the sum of its proper divisors (254822899).

631517421 is a wasteful number, since it uses less digits than its factorization.

631517421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11079275.

The product of its digits is 5040, while the sum is 30.

The square root of 631517421 is about 25130.0103660942. The cubic root of 631517421 is about 857.9496047362.

The spelling of 631517421 in words is "six hundred thirty-one million, five hundred seventeen thousand, four hundred twenty-one".