491555436 has 24 divisors (see below), whose sum is σ = 1163119104. Its totient is φ = 161543760.

The previous prime is 491555417. The next prime is 491555461. The reversal of 491555436 is 634555194.

It is a super-2 number, since 2×491555436² = 483253493322300192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287620 + ... + 289323.

It is an arithmetic number, because the mean of its divisors is an integer number (48463296).

Almost surely, 2^491555436 is an apocalyptic number.

It is an amenable number.

491555436 is an abundant number, since it is smaller than the sum of its proper divisors (671563668).

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

491555436 is a wasteful number, since it uses less digits than its factorization.

491555436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577021 (or 577019 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The square root of 491555436 is about 22171.0495015459. The cubic root of 491555436 is about 789.2068287577.

The spelling of 491555436 in words is "four hundred ninety-one million, five hundred fifty-five thousand, four hundred thirty-six".