91441257155533 has 2 divisors, whose sum is σ = 91441257155534. Its totient is φ = 91441257155532.

The previous prime is 91441257155531. The next prime is 91441257155557. The reversal of 91441257155533 is 33555175214419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59142529014724 + 32298728140809 = 7690418^2 + 5683197^2 .

It is a cyclic number.

It is not a de Polignac number, because 91441257155533 - 2¹ = 91441257155531 is a prime.

Together with 91441257155531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91441257155531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45720628577766 + 45720628577767.

It is an arithmetic number, because the mean of its divisors is an integer number (45720628577767).

Almost surely, 2^{91441257155533} is an apocalyptic number.

It is an amenable number.

91441257155533 is a deficient number, since it is larger than the sum of its proper divisors (1).

91441257155533 is an equidigital number, since it uses as much as digits as its factorization.

91441257155533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340000, while the sum is 55.

The spelling of 91441257155533 in words is "ninety-one trillion, four hundred forty-one billion, two hundred fifty-seven million, one hundred fifty-five thousand, five hundred thirty-three".