491642956 has 24 divisors (see below), whose sum is σ = 987630336. Its totient is φ = 209773200.

The previous prime is 491642923. The next prime is 491642959. The reversal of 491642956 is 659246194.

It is not an unprimeable number, because it can be changed into a prime (491642959) 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, 32320 + ... + 45031.

It is an arithmetic number, because the mean of its divisors is an integer number (41151264).

Almost surely, 2^491642956 is an apocalyptic number.

It is an amenable number.

491642956 is an abundant number, since it is smaller than the sum of its proper divisors (495987380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491642956 is a wasteful number, since it uses less digits than its factorization.

491642956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77589 (or 77587 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 491642956 is about 22173.0231587846. The cubic root of 491642956 is about 789.2536646299.

The spelling of 491642956 in words is "four hundred ninety-one million, six hundred forty-two thousand, nine hundred fifty-six".