91139378 has 12 divisors (see below), whose sum is σ = 150267390. Its totient is φ = 41426880.

The previous prime is 91139327. The next prime is 91139401. The reversal of 91139378 is 87393119.

It can be written as a sum of positive squares in only one way, i.e., 88868329 + 2271049 = 9427^2 + 1507^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188063 + ... + 188546.

Almost surely, 2^91139378 is an apocalyptic number.

91139378 is a deficient number, since it is larger than the sum of its proper divisors (59128012).

91139378 is a wasteful number, since it uses less digits than its factorization.

91139378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376633 (or 376622 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 91139378 is about 9546.6946112254. The cubic root of 91139378 is about 450.0236662450.

The spelling of 91139378 in words is "ninety-one million, one hundred thirty-nine thousand, three hundred seventy-eight".