630172561 has 8 divisors (see below), whose sum is σ = 658486080. Its totient is φ = 601935312.

The previous prime is 630172553. The next prime is 630172577. The reversal of 630172561 is 165271036.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 630172561 - 2³ = 630172553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630172511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1831 + ... + 35548.

It is an arithmetic number, because the mean of its divisors is an integer number (82310760).

Almost surely, 2^630172561 is an apocalyptic number.

It is an amenable number.

630172561 is a deficient number, since it is larger than the sum of its proper divisors (28313519).

630172561 is a wasteful number, since it uses less digits than its factorization.

630172561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38135.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 630172561 is about 25103.2380580673. The cubic root of 630172561 is about 857.3401509109.

The spelling of 630172561 in words is "six hundred thirty million, one hundred seventy-two thousand, five hundred sixty-one".