491940531 has 12 divisors (see below), whose sum is σ = 710946600. Its totient is φ = 327791520.

The previous prime is 491940529. The next prime is 491940569. The reversal of 491940531 is 135049194.

It is a happy number.

It is not a de Polignac number, because 491940531 - 2¹ = 491940529 is a prime.

It is a super-2 number, since 2×491940531² = 484010972081123922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (491940521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5871 + ... + 31911.

It is an arithmetic number, because the mean of its divisors is an integer number (59245550).

Almost surely, 2^491940531 is an apocalyptic number.

491940531 is a deficient number, since it is larger than the sum of its proper divisors (219006069).

491940531 is a wasteful number, since it uses less digits than its factorization.

491940531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28146 (or 28143 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 491940531 is about 22179.7324375205. The cubic root of 491940531 is about 789.4128687757.

The spelling of 491940531 in words is "four hundred ninety-one million, nine hundred forty thousand, five hundred thirty-one".