631604643 has 4 divisors (see below), whose sum is σ = 842139528. Its totient is φ = 421069760.

The previous prime is 631604639. The next prime is 631604647. The reversal of 631604643 is 346406136.

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

It is an interprime number because it is at equal distance from previous prime (631604639) and next prime (631604647).

It is a cyclic number.

It is not a de Polignac number, because 631604643 - 2² = 631604639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631604647) 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, 105267438 + ... + 105267443.

It is an arithmetic number, because the mean of its divisors is an integer number (210534882).

Almost surely, 2^631604643 is an apocalyptic number.

631604643 is a deficient number, since it is larger than the sum of its proper divisors (210534885).

631604643 is a wasteful number, since it uses less digits than its factorization.

631604643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210534884.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 631604643 is about 25131.7457212984. The cubic root of 631604643 is about 857.9891014748.

The spelling of 631604643 in words is "six hundred thirty-one million, six hundred four thousand, six hundred forty-three".