491115279629 has 4 divisors (see below), whose sum is σ = 528893378076. Its totient is φ = 453337181184.

The previous prime is 491115279593. The next prime is 491115279661. The reversal of 491115279629 is 926972511194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152804373604 + 338310906025 = 390902^2 + 581645^2 .

It is a cyclic number.

It is not a de Polignac number, because 491115279629 - 2²⁰ = 491114231053 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 (491115279929) 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, 18889049204 + ... + 18889049229.

It is an arithmetic number, because the mean of its divisors is an integer number (132223344519).

Almost surely, 2^491115279629 is an apocalyptic number.

It is an amenable number.

491115279629 is a deficient number, since it is larger than the sum of its proper divisors (37778098447).

491115279629 is a wasteful number, since it uses less digits than its factorization.

491115279629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37778098446.

The product of its digits is 2449440, while the sum is 56.

The spelling of 491115279629 in words is "four hundred ninety-one billion, one hundred fifteen million, two hundred seventy-nine thousand, six hundred twenty-nine".