91719619 has 2 divisors, whose sum is σ = 91719620. Its totient is φ = 91719618.

The previous prime is 91719613. The next prime is 91719623. The reversal of 91719619 is 91691719.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91719619 - 2⁷ = 91719491 is a prime.

It is a super-2 number, since 2×91719619² = 16824977019010322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91719613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45859809 + 45859810.

It is an arithmetic number, because the mean of its divisors is an integer number (45859810).

Almost surely, 2^91719619 is an apocalyptic number.

91719619 is a deficient number, since it is larger than the sum of its proper divisors (1).

91719619 is an equidigital number, since it uses as much as digits as its factorization.

91719619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 43.

The square root of 91719619 is about 9577.0360237393. The cubic root of 91719619 is about 450.9766754079.

The spelling of 91719619 in words is "ninety-one million, seven hundred nineteen thousand, six hundred nineteen".