91203244513 has 4 divisors (see below), whose sum is σ = 91284459568. Its totient is φ = 91122029460.

The previous prime is 91203244499. The next prime is 91203244537. The reversal of 91203244513 is 31544230219.

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 a de Polignac number, because none of the positive numbers 2^k-91203244513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91203244213) 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, 40605843 + ... + 40608088.

It is an arithmetic number, because the mean of its divisors is an integer number (22821114892).

Almost surely, 2^91203244513 is an apocalyptic number.

It is an amenable number.

91203244513 is a deficient number, since it is larger than the sum of its proper divisors (81215055).

91203244513 is a wasteful number, since it uses less digits than its factorization.

91203244513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81215054.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 91203244513 in words is "ninety-one billion, two hundred three million, two hundred forty-four thousand, five hundred thirteen".