291677840989 has 2 divisors, whose sum is σ = 291677840990. Its totient is φ = 291677840988.

The previous prime is 291677840977. The next prime is 291677841029. The reversal of 291677840989 is 989048776192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157040216089 + 134637624900 = 396283^2 + 366930^2 .

It is a cyclic number.

It is not a de Polignac number, because 291677840989 - 2³⁵ = 257318102621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291677840939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145838920494 + 145838920495.

It is an arithmetic number, because the mean of its divisors is an integer number (145838920495).

Almost surely, 2^291677840989 is an apocalyptic number.

It is an amenable number.

291677840989 is a deficient number, since it is larger than the sum of its proper divisors (1).

291677840989 is an equidigital number, since it uses as much as digits as its factorization.

291677840989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109734912, while the sum is 70.

The spelling of 291677840989 in words is "two hundred ninety-one billion, six hundred seventy-seven million, eight hundred forty thousand, nine hundred eighty-nine".