630515531 has 4 divisors (see below), whose sum is σ = 630571032. Its totient is φ = 630460032.

The previous prime is 630515521. The next prime is 630515563. The reversal of 630515531 is 135515036.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 630515531 - 2¹⁸ = 630253387 is a prime.

It is a super-2 number, since 2×630515531² = 795099669664423922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630515494 and 630515503.

It is not an unprimeable number, because it can be changed into a prime (630515521) 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, 3845 + ... + 35718.

It is an arithmetic number, because the mean of its divisors is an integer number (157642758).

Almost surely, 2^630515531 is an apocalyptic number.

630515531 is a deficient number, since it is larger than the sum of its proper divisors (55501).

630515531 is a wasteful number, since it uses less digits than its factorization.

630515531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55500.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 630515531 is about 25110.0683193017. The cubic root of 630515531 is about 857.4956578530.

The spelling of 630515531 in words is "six hundred thirty million, five hundred fifteen thousand, five hundred thirty-one".