491180899061 has 4 divisors (see below), whose sum is σ = 507025444224. Its totient is φ = 475336353900.

The previous prime is 491180899039. The next prime is 491180899067. The reversal of 491180899061 is 160998081194.

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 491180899061 - 2²² = 491176704757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491180898988 and 491180899006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491180899067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7922272535 + ... + 7922272596.

It is an arithmetic number, because the mean of its divisors is an integer number (126756361056).

Almost surely, 2^491180899061 is an apocalyptic number.

It is an amenable number.

491180899061 is a deficient number, since it is larger than the sum of its proper divisors (15844545163).

491180899061 is a wasteful number, since it uses less digits than its factorization.

491180899061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15844545162.

The product of its (nonzero) digits is 1119744, while the sum is 56.

The spelling of 491180899061 in words is "four hundred ninety-one billion, one hundred eighty million, eight hundred ninety-nine thousand, sixty-one".