631695649 has 8 divisors (see below), whose sum is σ = 702232832. Its totient is φ = 564293520.

The previous prime is 631695643. The next prime is 631695721. The reversal of 631695649 is 946596136.

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

It is a cyclic number.

It is not a de Polignac number, because 631695649 - 2⁷ = 631695521 is a prime.

It is a super-3 number, since 3×631695649³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (631695643) 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, 783339 + ... + 784144.

It is an arithmetic number, because the mean of its divisors is an integer number (87779104).

Almost surely, 2^631695649 is an apocalyptic number.

It is an amenable number.

631695649 is a deficient number, since it is larger than the sum of its proper divisors (70537183).

631695649 is a wasteful number, since it uses less digits than its factorization.

631695649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567527.

The product of its digits is 1049760, while the sum is 49.

The square root of 631695649 is about 25133.5562346438. The cubic root of 631695649 is about 858.0303078461.

The spelling of 631695649 in words is "six hundred thirty-one million, six hundred ninety-five thousand, six hundred forty-nine".