630390531 has 16 divisors (see below), whose sum is σ = 899267840. Its totient is φ = 391612320.

The previous prime is 630390529. The next prime is 630390557. The reversal of 630390531 is 135093036.

It is not a de Polignac number, because 630390531 - 2¹ = 630390529 is a prime.

It is a super-2 number, since 2×630390531² = 794784443148923922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630390511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87175 + ... + 94128.

It is an arithmetic number, because the mean of its divisors is an integer number (56204240).

Almost surely, 2^630390531 is an apocalyptic number.

630390531 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

630390531 is a deficient number, since it is larger than the sum of its proper divisors (268877309).

630390531 is a wasteful number, since it uses less digits than its factorization.

630390531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181386.

The product of its (nonzero) digits is 7290, while the sum is 30.

The square root of 630390531 is about 25107.5791545103. The cubic root of 630390531 is about 857.4389878023.

The spelling of 630390531 in words is "six hundred thirty million, three hundred ninety thousand, five hundred thirty-one".