91970439 has 16 divisors (see below), whose sum is σ = 136045440. Its totient is φ = 54793760.

The previous prime is 91970413. The next prime is 91970441. The reversal of 91970439 is 93407919.

It is a cyclic number.

It is not a de Polignac number, because 91970439 - 2⁸ = 91970183 is a prime.

It is a super-3 number, since 3×91970439³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 91970439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91970239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21672 + ... + 25565.

It is an arithmetic number, because the mean of its divisors is an integer number (8502840).

Almost surely, 2^91970439 is an apocalyptic number.

91970439 is a deficient number, since it is larger than the sum of its proper divisors (44075001).

91970439 is a wasteful number, since it uses less digits than its factorization.

91970439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47310.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 91970439 is about 9590.1219491725. The cubic root of 91970439 is about 451.3873873098.

The spelling of 91970439 in words is "ninety-one million, nine hundred seventy thousand, four hundred thirty-nine".