91432147 has 4 divisors (see below), whose sum is σ = 93558520. Its totient is φ = 89305776.

The previous prime is 91432139. The next prime is 91432163. The reversal of 91432147 is 74123419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91432147 - 2³ = 91432139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91432177) 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, 1063122 + ... + 1063207.

It is an arithmetic number, because the mean of its divisors is an integer number (23389630).

Almost surely, 2^91432147 is an apocalyptic number.

91432147 is a deficient number, since it is larger than the sum of its proper divisors (2126373).

91432147 is a wasteful number, since it uses less digits than its factorization.

91432147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126372.

The product of its digits is 6048, while the sum is 31.

The square root of 91432147 is about 9562.0158439526. The cubic root of 91432147 is about 450.5050247797.

The spelling of 91432147 in words is "ninety-one million, four hundred thirty-two thousand, one hundred forty-seven".