91420559 has 4 divisors (see below), whose sum is σ = 92970120. Its totient is φ = 89871000.

The previous prime is 91420541. The next prime is 91420591. The reversal of 91420559 is 95502419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95502419 = 691 ⋅138209.

It is a cyclic number.

It is not a de Polignac number, because 91420559 - 2¹⁶ = 91355023 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 (91420159) 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, 774692 + ... + 774809.

It is an arithmetic number, because the mean of its divisors is an integer number (23242530).

Almost surely, 2^91420559 is an apocalyptic number.

91420559 is a deficient number, since it is larger than the sum of its proper divisors (1549561).

91420559 is a wasteful number, since it uses less digits than its factorization.

91420559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549560.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 91420559 is about 9561.4098855765. The cubic root of 91420559 is about 450.4859918211.

The spelling of 91420559 in words is "ninety-one million, four hundred twenty thousand, five hundred fifty-nine".