630921557 has 8 divisors (see below), whose sum is σ = 722183232. Its totient is φ = 539942400.

The previous prime is 630921547. The next prime is 630921563. The reversal of 630921557 is 755129036.

It is a happy number.

630921557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 630921557 - 2¹⁶ = 630856021 is a prime.

It is a super-2 number, since 2×630921557² = 796124022174608498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 630921557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630921547) 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, 65819 + ... + 74792.

It is an arithmetic number, because the mean of its divisors is an integer number (90272904).

Almost surely, 2^630921557 is an apocalyptic number.

It is an amenable number.

630921557 is a deficient number, since it is larger than the sum of its proper divisors (91261675).

630921557 is a wasteful number, since it uses less digits than its factorization.

630921557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141259.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 630921557 is about 25118.1519423703. The cubic root of 630921557 is about 857.6796823043.

The spelling of 630921557 in words is "six hundred thirty million, nine hundred twenty-one thousand, five hundred fifty-seven".