491913578 has 16 divisors (see below), whose sum is σ = 802825800. Its totient is φ = 224695296.

The previous prime is 491913559. The next prime is 491913599. The reversal of 491913578 is 875319194.

It can be written as a sum of positive squares in 4 ways, for example, as 214124689 + 277788889 = 14633^2 + 16667^2 .

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, 95003 + ... + 100046.

Almost surely, 2^491913578 is an apocalyptic number.

491913578 is a deficient number, since it is larger than the sum of its proper divisors (310912222).

491913578 is a wasteful number, since it uses less digits than its factorization.

491913578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195161.

The product of its digits is 272160, while the sum is 47.

The square root of 491913578 is about 22179.1248249339. The cubic root of 491913578 is about 789.3984514276.

The spelling of 491913578 in words is "four hundred ninety-one million, nine hundred thirteen thousand, five hundred seventy-eight".