91419389 has 2 divisors, whose sum is σ = 91419390. Its totient is φ = 91419388.

The previous prime is 91419359. The next prime is 91419407. The reversal of 91419389 is 98391419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70644025 + 20775364 = 8405^2 + 4558^2 .

It is a cyclic number.

It is not a de Polignac number, because 91419389 - 2¹² = 91415293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91419359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45709694 + 45709695.

It is an arithmetic number, because the mean of its divisors is an integer number (45709695).

Almost surely, 2^91419389 is an apocalyptic number.

It is an amenable number.

91419389 is a deficient number, since it is larger than the sum of its proper divisors (1).

91419389 is an equidigital number, since it uses as much as digits as its factorization.

91419389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 44.

The square root of 91419389 is about 9561.3487019353. The cubic root of 91419389 is about 450.4840700402.

The spelling of 91419389 in words is "ninety-one million, four hundred nineteen thousand, three hundred eighty-nine".