631890817 has 8 divisors (see below), whose sum is σ = 634735296. Its totient is φ = 629052912.

The previous prime is 631890797. The next prime is 631890851. The reversal of 631890817 is 718098136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631890817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631890877) 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, 306763 + ... + 308815.

It is an arithmetic number, because the mean of its divisors is an integer number (79341912).

Almost surely, 2^631890817 is an apocalyptic number.

It is an amenable number.

631890817 is a deficient number, since it is larger than the sum of its proper divisors (2844479).

631890817 is a wasteful number, since it uses less digits than its factorization.

631890817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 631890817 is about 25137.4385528836. The cubic root of 631890817 is about 858.1186641171.

The spelling of 631890817 in words is "six hundred thirty-one million, eight hundred ninety thousand, eight hundred seventeen".