630897257 has 4 divisors (see below), whose sum is σ = 634200576. Its totient is φ = 627593940.

The previous prime is 630897209. The next prime is 630897263. The reversal of 630897257 is 752798036.

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 not a de Polignac number, because 630897257 - 2¹² = 630893161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630827257) 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, 1651373 + ... + 1651754.

It is an arithmetic number, because the mean of its divisors is an integer number (158550144).

Almost surely, 2^630897257 is an apocalyptic number.

It is an amenable number.

630897257 is a deficient number, since it is larger than the sum of its proper divisors (3303319).

630897257 is a wasteful number, since it uses less digits than its factorization.

630897257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303318.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 630897257 is about 25117.6682237822. The cubic root of 630897257 is about 857.6686709598.

The spelling of 630897257 in words is "six hundred thirty million, eight hundred ninety-seven thousand, two hundred fifty-seven".