291116329657 has 2 divisors, whose sum is σ = 291116329658. Its totient is φ = 291116329656.

The previous prime is 291116329591. The next prime is 291116329727. The reversal of 291116329657 is 756923611192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207187922041 + 83928407616 = 455179^2 + 289704^2 .

It is a cyclic number.

It is not a de Polignac number, because 291116329657 - 2⁷ = 291116329529 is a prime.

It is a super-3 number, since 3×291116329657³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (291116320657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145558164828 + 145558164829.

It is an arithmetic number, because the mean of its divisors is an integer number (145558164829).

Almost surely, 2^291116329657 is an apocalyptic number.

It is an amenable number.

291116329657 is a deficient number, since it is larger than the sum of its proper divisors (1).

291116329657 is an equidigital number, since it uses as much as digits as its factorization.

291116329657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 52.

The spelling of 291116329657 in words is "two hundred ninety-one billion, one hundred sixteen million, three hundred twenty-nine thousand, six hundred fifty-seven".