91447513 has 4 divisors (see below), whose sum is σ = 96260560. Its totient is φ = 86634468.

The previous prime is 91447511. The next prime is 91447523. The reversal of 91447513 is 31574419.

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 91447513 - 2¹ = 91447511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91447511) 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, 2406495 + ... + 2406532.

It is an arithmetic number, because the mean of its divisors is an integer number (24065140).

Almost surely, 2^91447513 is an apocalyptic number.

It is an amenable number.

91447513 is a deficient number, since it is larger than the sum of its proper divisors (4813047).

91447513 is a wasteful number, since it uses less digits than its factorization.

91447513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813046.

The product of its digits is 15120, while the sum is 34.

The square root of 91447513 is about 9562.8193018586. The cubic root of 91447513 is about 450.5302605153.

The spelling of 91447513 in words is "ninety-one million, four hundred forty-seven thousand, five hundred thirteen".