91013945 has 8 divisors (see below), whose sum is σ = 119145600. Its totient is φ = 66191920.

The previous prime is 91013911. The next prime is 91013947. The reversal of 91013945 is 54931019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-91013945 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91013947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827345 + ... + 827454.

It is an arithmetic number, because the mean of its divisors is an integer number (14893200).

Almost surely, 2^91013945 is an apocalyptic number.

It is an amenable number.

91013945 is a deficient number, since it is larger than the sum of its proper divisors (28131655).

91013945 is a wasteful number, since it uses less digits than its factorization.

91013945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654815.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 91013945 is about 9540.1229027723. The cubic root of 91013945 is about 449.8171191025.

The spelling of 91013945 in words is "ninety-one million, thirteen thousand, nine hundred forty-five".