91226017657 has 2 divisors, whose sum is σ = 91226017658. Its totient is φ = 91226017656.

The previous prime is 91226017567. The next prime is 91226017667. The reversal of 91226017657 is 75671062219.

Together with previous prime (91226017567) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77052877056 + 14173140601 = 277584^2 + 119051^2 .

It is a cyclic number.

It is not a de Polignac number, because 91226017657 - 2¹⁹ = 91225493369 is a prime.

It is not a weakly prime, because it can be changed into another prime (91226017667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45613008828 + 45613008829.

It is an arithmetic number, because the mean of its divisors is an integer number (45613008829).

Almost surely, 2^91226017657 is an apocalyptic number.

It is an amenable number.

91226017657 is a deficient number, since it is larger than the sum of its proper divisors (1).

91226017657 is an equidigital number, since it uses as much as digits as its factorization.

91226017657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 91226017657 in words is "ninety-one billion, two hundred twenty-six million, seventeen thousand, six hundred fifty-seven".