91197423 has 6 divisors (see below), whose sum is σ = 131729624. Its totient is φ = 60798276.

The previous prime is 91197419. The next prime is 91197433. The reversal of 91197423 is 32479119.

It is not a de Polignac number, because 91197423 - 2² = 91197419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91197433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5066515 + ... + 5066532.

Almost surely, 2^91197423 is an apocalyptic number.

91197423 is a deficient number, since it is larger than the sum of its proper divisors (40532201).

91197423 is a wasteful number, since it uses less digits than its factorization.

91197423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133053 (or 10133050 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 91197423 is about 9549.7341847823. The cubic root of 91197423 is about 450.1191832461.

The spelling of 91197423 in words is "ninety-one million, one hundred ninety-seven thousand, four hundred twenty-three".