631559421 has 6 divisors (see below), whose sum is σ = 912252510. Its totient is φ = 421039608.

The previous prime is 631559399. The next prime is 631559429. The reversal of 631559421 is 124955136.

631559421 is a `hidden beast` number, since 63 + 1 + 5 + 594 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 461648196 + 169911225 = 21486^2 + 13035^2 .

It is not a de Polignac number, because 631559421 - 2⁷ = 631559293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631559429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35086626 + ... + 35086643.

It is an arithmetic number, because the mean of its divisors is an integer number (152042085).

Almost surely, 2^631559421 is an apocalyptic number.

It is an amenable number.

631559421 is a deficient number, since it is larger than the sum of its proper divisors (280693089).

631559421 is a wasteful number, since it uses less digits than its factorization.

631559421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70173275 (or 70173272 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 631559421 is about 25130.8460064519. The cubic root of 631559421 is about 857.9686240503.

The spelling of 631559421 in words is "six hundred thirty-one million, five hundred fifty-nine thousand, four hundred twenty-one".