631624221401 has 4 divisors (see below), whose sum is σ = 631643280000. Its totient is φ = 631605162804.

The previous prime is 631624221359. The next prime is 631624221511. The reversal of 631624221401 is 104122426136.

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-631624221401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631624221301) 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, 9479501 + ... + 9545898.

It is an arithmetic number, because the mean of its divisors is an integer number (157910820000).

Almost surely, 2^631624221401 is an apocalyptic number.

It is an amenable number.

631624221401 is a deficient number, since it is larger than the sum of its proper divisors (19058599).

631624221401 is a wasteful number, since it uses less digits than its factorization.

631624221401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19058598.

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 631624221401 its reverse (104122426136), we get a palindrome (735746647537).

The spelling of 631624221401 in words is "six hundred thirty-one billion, six hundred twenty-four million, two hundred twenty-one thousand, four hundred one".