91195526381 has 2 divisors, whose sum is σ = 91195526382. Its totient is φ = 91195526380.

The previous prime is 91195526341. The next prime is 91195526419. The reversal of 91195526381 is 18362559119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45851656900 + 45343869481 = 214130^2 + 212941^2 .

It is a cyclic number.

It is not a de Polignac number, because 91195526381 - 2¹⁰ = 91195525357 is a prime.

It is a super-2 number, since 2×91195526381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91195526311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45597763190 + 45597763191.

It is an arithmetic number, because the mean of its divisors is an integer number (45597763191).

Almost surely, 2^91195526381 is an apocalyptic number.

It is an amenable number.

91195526381 is a deficient number, since it is larger than the sum of its proper divisors (1).

91195526381 is an equidigital number, since it uses as much as digits as its factorization.

91195526381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The spelling of 91195526381 in words is "ninety-one billion, one hundred ninety-five million, five hundred twenty-six thousand, three hundred eighty-one".