91149197541 has 4 divisors (see below), whose sum is σ = 121532263392. Its totient is φ = 60766131692.

The previous prime is 91149197537. The next prime is 91149197611. The reversal of 91149197541 is 14579194119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91149197541 - 2² = 91149197537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91149197141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15191532921 + ... + 15191532926.

It is an arithmetic number, because the mean of its divisors is an integer number (30383065848).

Almost surely, 2^91149197541 is an apocalyptic number.

It is an amenable number.

91149197541 is a deficient number, since it is larger than the sum of its proper divisors (30383065851).

91149197541 is a wasteful number, since it uses less digits than its factorization.

91149197541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30383065850.

The product of its digits is 408240, while the sum is 51.

The spelling of 91149197541 in words is "ninety-one billion, one hundred forty-nine million, one hundred ninety-seven thousand, five hundred forty-one".