630509081 has 4 divisors (see below), whose sum is σ = 631121664. Its totient is φ = 629896500.

The previous prime is 630509069. The next prime is 630509101. The reversal of 630509081 is 180905036.

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 a de Polignac number, because none of the positive numbers 2^k-630509081 is a prime.

It is a super-2 number, since 2×630509081² = 795083402446929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630559081) 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, 304745 + ... + 306806.

It is an arithmetic number, because the mean of its divisors is an integer number (157780416).

Almost surely, 2^630509081 is an apocalyptic number.

It is an amenable number.

630509081 is a deficient number, since it is larger than the sum of its proper divisors (612583).

630509081 is a wasteful number, since it uses less digits than its factorization.

630509081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612582.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 630509081 is about 25109.9398844362. The cubic root of 630509081 is about 857.4927338617.

The spelling of 630509081 in words is "six hundred thirty million, five hundred nine thousand, eighty-one".