91987269 has 16 divisors (see below), whose sum is σ = 134244864. Its totient is φ = 55564400.

The previous prime is 91987267. The next prime is 91987279. The reversal of 91987269 is 96278919.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91987269 - 2¹ = 91987267 is a prime.

It is a super-2 number, since 2×91987269² = 16923315316156722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91987267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5782 + ... + 14744.

It is an arithmetic number, because the mean of its divisors is an integer number (8390304).

Almost surely, 2^91987269 is an apocalyptic number.

It is an amenable number.

91987269 is a deficient number, since it is larger than the sum of its proper divisors (42257595).

91987269 is a wasteful number, since it uses less digits than its factorization.

91987269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9288.

The product of its digits is 489888, while the sum is 51.

The square root of 91987269 is about 9590.9993744135. Note that the first 3 decimals coincide. The cubic root of 91987269 is about 451.4149192953.

It can be divided in two parts, 919 and 87269, that added together give a palindrome (88188).

The spelling of 91987269 in words is "ninety-one million, nine hundred eighty-seven thousand, two hundred sixty-nine".