91860869 has 8 divisors (see below), whose sum is σ = 94250520. Its totient is φ = 89478400.

The previous prime is 91860851. The next prime is 91860871. The reversal of 91860869 is 96806819.

It can be written as a sum of positive squares in 4 ways, for example, as 7496644 + 84364225 = 2738^2 + 9185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91860869 - 2²⁴ = 75083653 is a prime.

It is a super-2 number, since 2×91860869² = 16876838506870322, 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 (91860569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32297 + ... + 35025.

It is an arithmetic number, because the mean of its divisors is an integer number (11781315).

Almost surely, 2^91860869 is an apocalyptic number.

It is an amenable number.

91860869 is a deficient number, since it is larger than the sum of its proper divisors (2389651).

91860869 is a wasteful number, since it uses less digits than its factorization.

91860869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 91860869 is about 9584.4075977600. The cubic root of 91860869 is about 451.2080609576.

It can be divided in two parts, 91860 and 869, that added together give a palindrome (92729).

The spelling of 91860869 in words is "ninety-one million, eight hundred sixty thousand, eight hundred sixty-nine".