631430073 has 20 divisors (see below), whose sum is σ = 944205108. Its totient is φ = 420526080.

The previous prime is 631430069. The next prime is 631430089. The reversal of 631430073 is 370034136.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 501401664 + 130028409 = 22392^2 + 11403^2 .

It is not a de Polignac number, because 631430073 - 2² = 631430069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (631430773) 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 19 ways as a sum of consecutive naturals, for example, 90013 + ... + 96773.

Almost surely, 2^631430073 is an apocalyptic number.

It is an amenable number.

631430073 is a deficient number, since it is larger than the sum of its proper divisors (312775035).

631430073 is a wasteful number, since it uses less digits than its factorization.

631430073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7926 (or 7917 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 631430073 is about 25128.2723839105. The cubic root of 631430073 is about 857.9100472962.

The spelling of 631430073 in words is "six hundred thirty-one million, four hundred thirty thousand, seventy-three".