631455121 has 4 divisors (see below), whose sum is σ = 688860144. Its totient is φ = 574050100.

The previous prime is 631455113. The next prime is 631455127. The reversal of 631455121 is 121554136.

631455121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 631455121 - 2³ = 631455113 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 631455121.

It is not an unprimeable number, because it can be changed into a prime (631455127) 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, 28702495 + ... + 28702516.

It is an arithmetic number, because the mean of its divisors is an integer number (172215036).

Almost surely, 2^631455121 is an apocalyptic number.

It is an amenable number.

631455121 is a deficient number, since it is larger than the sum of its proper divisors (57405023).

631455121 is a wasteful number, since it uses less digits than its factorization.

631455121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57405022.

The product of its digits is 3600, while the sum is 28.

The square root of 631455121 is about 25128.7707817155. The cubic root of 631455121 is about 857.9213912004.

The spelling of 631455121 in words is "six hundred thirty-one million, four hundred fifty-five thousand, one hundred twenty-one".