91547405501 has 2 divisors, whose sum is σ = 91547405502. Its totient is φ = 91547405500.

The previous prime is 91547405497. The next prime is 91547405527. The reversal of 91547405501 is 10550474519.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49951803001 + 41595602500 = 223499^2 + 203950^2 .

It is a cyclic number.

It is not a de Polignac number, because 91547405501 - 2² = 91547405497 is a prime.

It is a super-2 number, since 2×91547405501² (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 (91547455501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45773702750 + 45773702751.

It is an arithmetic number, because the mean of its divisors is an integer number (45773702751).

Almost surely, 2^91547405501 is an apocalyptic number.

It is an amenable number.

91547405501 is a deficient number, since it is larger than the sum of its proper divisors (1).

91547405501 is an equidigital number, since it uses as much as digits as its factorization.

91547405501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 91547405501 in words is "ninety-one billion, five hundred forty-seven million, four hundred five thousand, five hundred one".