91222511057437 has 2 divisors, whose sum is σ = 91222511057438. Its totient is φ = 91222511057436.

The previous prime is 91222511057429. The next prime is 91222511057467. The reversal of 91222511057437 is 73475011522219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74365459378681 + 16857051678756 = 8623541^2 + 4105734^2 .

It is a cyclic number.

It is not a de Polignac number, because 91222511057437 - 2³ = 91222511057429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91222511057467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45611255528718 + 45611255528719.

It is an arithmetic number, because the mean of its divisors is an integer number (45611255528719).

Almost surely, 2^{91222511057437} is an apocalyptic number.

It is an amenable number.

91222511057437 is a deficient number, since it is larger than the sum of its proper divisors (1).

91222511057437 is an equidigital number, since it uses as much as digits as its factorization.

91222511057437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 91222511057437 in words is "ninety-one trillion, two hundred twenty-two billion, five hundred eleven million, fifty-seven thousand, four hundred thirty-seven".