491188490 has 32 divisors (see below), whose sum is σ = 982872576. Its totient is φ = 175510080.

The previous prime is 491188469. The next prime is 491188499. The reversal of 491188490 is 94881194.

It is a super-2 number, since 2×491188490² = 482532265416960200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491188499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56912 + ... + 64971.

It is an arithmetic number, because the mean of its divisors is an integer number (30714768).

Almost surely, 2^491188490 is an apocalyptic number.

491188490 is an abundant number, since it is smaller than the sum of its proper divisors (491684086).

491188490 is a wasteful number, since it uses less digits than its factorization.

491188490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121934.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 491188490 is about 22162.7726153566. The cubic root of 491188490 is about 789.0103989767.

The spelling of 491188490 in words is "four hundred ninety-one million, one hundred eighty-eight thousand, four hundred ninety".