91520719 has 4 divisors (see below), whose sum is σ = 91618920. Its totient is φ = 91422520.

The previous prime is 91520683. The next prime is 91520743. The reversal of 91520719 is 91702519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91702519 = 929 ⋅98711.

It is a cyclic number.

It is not a de Polignac number, because 91520719 - 2¹¹ = 91518671 is a prime.

It is a super-2 number, since 2×91520719² = 16752084012553922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91521719) 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, 47689 + ... + 49570.

It is an arithmetic number, because the mean of its divisors is an integer number (22904730).

Almost surely, 2^91520719 is an apocalyptic number.

91520719 is a deficient number, since it is larger than the sum of its proper divisors (98201).

91520719 is an equidigital number, since it uses as much as digits as its factorization.

91520719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98200.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 91520719 is about 9566.6461730326. The cubic root of 91520719 is about 450.6504486619.

The spelling of 91520719 in words is "ninety-one million, five hundred twenty thousand, seven hundred nineteen".