91370723 has 4 divisors (see below), whose sum is σ = 93840240. Its totient is φ = 88901208.

The previous prime is 91370711. The next prime is 91370731. The reversal of 91370723 is 32707319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32707319 = 197 ⋅166027.

It is a cyclic number.

It is not a de Polignac number, because 91370723 - 2¹⁴ = 91354339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91370723.

It is not an unprimeable number, because it can be changed into a prime (91360723) 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, 1234703 + ... + 1234776.

It is an arithmetic number, because the mean of its divisors is an integer number (23460060).

Almost surely, 2^91370723 is an apocalyptic number.

91370723 is a deficient number, since it is larger than the sum of its proper divisors (2469517).

91370723 is a wasteful number, since it uses less digits than its factorization.

91370723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469516.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 91370723 is about 9558.8034293001. The cubic root of 91370723 is about 450.4041192795.

The spelling of 91370723 in words is "ninety-one million, three hundred seventy thousand, seven hundred twenty-three".