491507812 has 6 divisors (see below), whose sum is σ = 860138678. Its totient is φ = 245753904.

The previous prime is 491507767. The next prime is 491507839. The reversal of 491507812 is 218705194.

It can be written as a sum of positive squares in only one way, i.e., 278756416 + 212751396 = 16696^2 + 14586^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61438473 + ... + 61438480.

Almost surely, 2^491507812 is an apocalyptic number.

It is an amenable number.

491507812 is a deficient number, since it is larger than the sum of its proper divisors (368630866).

491507812 is a wasteful number, since it uses less digits than its factorization.

491507812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122876957 (or 122876955 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 491507812 is about 22169.9754623229. The cubic root of 491507812 is about 789.1813406865.

The spelling of 491507812 in words is "four hundred ninety-one million, five hundred seven thousand, eight hundred twelve".