491430198977 has 2 divisors, whose sum is σ = 491430198978. Its totient is φ = 491430198976.

The previous prime is 491430198949. The next prime is 491430199003. The reversal of 491430198977 is 779891034194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440980996096 + 50449202881 = 664064^2 + 224609^2 .

It is a cyclic number.

It is not a de Polignac number, because 491430198977 - 2³⁴ = 474250329793 is a prime.

It is not a weakly prime, because it can be changed into another prime (491430198907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245715099488 + 245715099489.

It is an arithmetic number, because the mean of its divisors is an integer number (245715099489).

Almost surely, 2^491430198977 is an apocalyptic number.

It is an amenable number.

491430198977 is a deficient number, since it is larger than the sum of its proper divisors (1).

491430198977 is an equidigital number, since it uses as much as digits as its factorization.

491430198977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 491430198977 in words is "four hundred ninety-one billion, four hundred thirty million, one hundred ninety-eight thousand, nine hundred seventy-seven".