631375421 has 4 divisors (see below), whose sum is σ = 633776352. Its totient is φ = 628974492.

The previous prime is 631375417. The next prime is 631375429. The reversal of 631375421 is 124573136.

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 not a de Polignac number, because 631375421 - 2² = 631375417 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 (631375429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200071 + ... + 1200596.

It is an arithmetic number, because the mean of its divisors is an integer number (158444088).

Almost surely, 2^631375421 is an apocalyptic number.

It is an amenable number.

631375421 is a deficient number, since it is larger than the sum of its proper divisors (2400931).

631375421 is a wasteful number, since it uses less digits than its factorization.

631375421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400930.

The product of its digits is 15120, while the sum is 32.

The square root of 631375421 is about 25127.1849000241. The cubic root of 631375421 is about 857.8852950950.

The spelling of 631375421 in words is "six hundred thirty-one million, three hundred seventy-five thousand, four hundred twenty-one".