91192138 has 8 divisors (see below), whose sum is σ = 136831140. Its totient is φ = 45581760.

The previous prime is 91192093. The next prime is 91192139. The reversal of 91192138 is 83129119.

It can be written as a sum of positive squares in 2 ways, for example, as 83777409 + 7414729 = 9153^2 + 2723^2 .

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

It is a super-2 number, since 2×91192138² = 16632012066022088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91192139) 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 3 ways as a sum of consecutive naturals, for example, 4818 + ... + 14338.

Almost surely, 2^91192138 is an apocalyptic number.

91192138 is a deficient number, since it is larger than the sum of its proper divisors (45639002).

91192138 is a wasteful number, since it uses less digits than its factorization.

91192138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14312.

The product of its digits is 3888, while the sum is 34.

The square root of 91192138 is about 9549.4574715007. The cubic root of 91192138 is about 450.1104880961.

The spelling of 91192138 in words is "ninety-one million, one hundred ninety-two thousand, one hundred thirty-eight".