491570336837 has 4 divisors (see below), whose sum is σ = 491679409536. Its totient is φ = 491461264140.

The previous prime is 491570336827. The next prime is 491570336849. The reversal of 491570336837 is 738633075194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491570336837 - 2¹⁴ = 491570320453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491570336827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54529589 + ... + 54538602.

It is an arithmetic number, because the mean of its divisors is an integer number (122919852384).

Almost surely, 2^491570336837 is an apocalyptic number.

It is an amenable number.

491570336837 is a deficient number, since it is larger than the sum of its proper divisors (109072699).

491570336837 is a wasteful number, since it uses less digits than its factorization.

491570336837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109072698.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 491570336837 in words is "four hundred ninety-one billion, five hundred seventy million, three hundred thirty-six thousand, eight hundred thirty-seven".