491806554 has 16 divisors (see below), whose sum is σ = 985262400. Its totient is φ = 163660640.

The previous prime is 491806541. The next prime is 491806591. The reversal of 491806554 is 455608194.

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, 64827 + ... + 72014.

It is an arithmetic number, because the mean of its divisors is an integer number (61578900).

Almost surely, 2^491806554 is an apocalyptic number.

491806554 is an abundant number, since it is smaller than the sum of its proper divisors (493455846).

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

491806554 is a wasteful number, since it uses less digits than its factorization.

491806554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137445.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 491806554 is about 22176.7119745015. The cubic root of 491806554 is about 789.3411983440.

The spelling of 491806554 in words is "four hundred ninety-one million, eight hundred six thousand, five hundred fifty-four".