91401886 has 8 divisors (see below), whose sum is σ = 137187144. Its totient is φ = 45672840.

The previous prime is 91401859. The next prime is 91401889. The reversal of 91401886 is 68810419.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91401889) 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, 9720 + ... + 16651.

It is an arithmetic number, because the mean of its divisors is an integer number (17148393).

Almost surely, 2^91401886 is an apocalyptic number.

91401886 is a deficient number, since it is larger than the sum of its proper divisors (45785258).

91401886 is a wasteful number, since it uses less digits than its factorization.

91401886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28106.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 91401886 is about 9560.4333583787. The cubic root of 91401886 is about 450.4553185685.

It can be divided in two parts, 9140 and 1886, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 91401886 in words is "ninety-one million, four hundred one thousand, eight hundred eighty-six".