630931789 has 2 divisors, whose sum is σ = 630931790. Its totient is φ = 630931788.

The previous prime is 630931787. The next prime is 630931799. The reversal of 630931789 is 987139036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485849764 + 145082025 = 22042^2 + 12045^2 .

It is a cyclic number.

It is not a de Polignac number, because 630931789 - 2¹ = 630931787 is a prime.

Together with 630931787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630931787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315465894 + 315465895.

It is an arithmetic number, because the mean of its divisors is an integer number (315465895).

Almost surely, 2^630931789 is an apocalyptic number.

It is an amenable number.

630931789 is a deficient number, since it is larger than the sum of its proper divisors (1).

630931789 is an equidigital number, since it uses as much as digits as its factorization.

630931789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 630931789 is about 25118.3556189493. The cubic root of 630931789 is about 857.6843187661.

The spelling of 630931789 in words is "six hundred thirty million, nine hundred thirty-one thousand, seven hundred eighty-nine".