91101356641 has 2 divisors, whose sum is σ = 91101356642. Its totient is φ = 91101356640.

The previous prime is 91101356603. The next prime is 91101356657. The reversal of 91101356641 is 14665310119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73986176016 + 17115180625 = 272004^2 + 130825^2 .

It is an emirp because it is prime and its reverse (14665310119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91101356641 - 2¹¹ = 91101354593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91101356641.

It is not a weakly prime, because it can be changed into another prime (91101306641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45550678320 + 45550678321.

It is an arithmetic number, because the mean of its divisors is an integer number (45550678321).

Almost surely, 2^91101356641 is an apocalyptic number.

It is an amenable number.

91101356641 is a deficient number, since it is larger than the sum of its proper divisors (1).

91101356641 is an equidigital number, since it uses as much as digits as its factorization.

91101356641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 91101356641 in words is "ninety-one billion, one hundred one million, three hundred fifty-six thousand, six hundred forty-one".