491308739 has 4 divisors (see below), whose sum is σ = 507157440. Its totient is φ = 475460040.

The previous prime is 491308723. The next prime is 491308757. The reversal of 491308739 is 937803194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491308739 - 2⁴ = 491308723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491308739.

It is not an unprimeable number, because it can be changed into a prime (491308759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7924304 + ... + 7924365.

It is an arithmetic number, because the mean of its divisors is an integer number (126789360).

Almost surely, 2^491308739 is an apocalyptic number.

491308739 is a deficient number, since it is larger than the sum of its proper divisors (15848701).

491308739 is a wasteful number, since it uses less digits than its factorization.

491308739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15848700.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 491308739 is about 22165.4853093723. The cubic root of 491308739 is about 789.0747802152.

The spelling of 491308739 in words is "four hundred ninety-one million, three hundred eight thousand, seven hundred thirty-nine".