631349491 has 8 divisors (see below), whose sum is σ = 634544064. Its totient is φ = 628162920.

The previous prime is 631349489. The next prime is 631349531. The reversal of 631349491 is 194943136.

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 631349491 - 2¹ = 631349489 is a prime.

It is a super-3 number, since 3×631349491³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631349591) 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, 208176 + ... + 211186.

It is an arithmetic number, because the mean of its divisors is an integer number (79318008).

Almost surely, 2^631349491 is an apocalyptic number.

631349491 is a deficient number, since it is larger than the sum of its proper divisors (3194573).

631349491 is a wasteful number, since it uses less digits than its factorization.

631349491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001.

The product of its digits is 69984, while the sum is 40.

The square root of 631349491 is about 25126.6689196957. The cubic root of 631349491 is about 857.8735507510.

The spelling of 631349491 in words is "six hundred thirty-one million, three hundred forty-nine thousand, four hundred ninety-one".