91136438 has 8 divisors (see below), whose sum is σ = 137748600. Its totient is φ = 45220240.

The previous prime is 91136413. The next prime is 91136467. The reversal of 91136438 is 83463119.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91136398 and 91136407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173663 + ... + 174186.

It is an arithmetic number, because the mean of its divisors is an integer number (17218575).

Almost surely, 2^91136438 is an apocalyptic number.

91136438 is a deficient number, since it is larger than the sum of its proper divisors (46612162).

91136438 is a wasteful number, since it uses less digits than its factorization.

91136438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347982.

The product of its digits is 15552, while the sum is 35.

The square root of 91136438 is about 9546.5406299874. The cubic root of 91136438 is about 450.0188271958.

It can be divided in two parts, 9113 and 6438, that added together give a palindrome (15551).

The spelling of 91136438 in words is "ninety-one million, one hundred thirty-six thousand, four hundred thirty-eight".