630720987731 has 4 divisors (see below), whose sum is σ = 630834249000. Its totient is φ = 630607726464.

The previous prime is 630720987713. The next prime is 630720987737. The reversal of 630720987731 is 137789027036.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630720987731 is a prime.

It is a super-2 number, since 2×630720987731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630720987737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56622281 + ... + 56633418.

It is an arithmetic number, because the mean of its divisors is an integer number (157708562250).

Almost surely, 2^630720987731 is an apocalyptic number.

630720987731 is a deficient number, since it is larger than the sum of its proper divisors (113261269).

630720987731 is a wasteful number, since it uses less digits than its factorization.

630720987731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113261268.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 630720987731 in words is "six hundred thirty billion, seven hundred twenty million, nine hundred eighty-seven thousand, seven hundred thirty-one".