138833091 has 6 divisors (see below), whose sum is σ = 200536700. Its totient is φ = 92555388.

The previous prime is 138833081. The next prime is 138833141. The reversal of 138833091 is 190338831.

It is not a de Polignac number, because 138833091 - 2⁷ = 138832963 is a prime.

It is a super-2 number, since 2×138833091² = 38549254313228562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138833081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7712941 + ... + 7712958.

Almost surely, 2^138833091 is an apocalyptic number.

138833091 is a deficient number, since it is larger than the sum of its proper divisors (61703609).

138833091 is a wasteful number, since it uses less digits than its factorization.

138833091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425905 (or 15425902 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 138833091 is about 11782.7454780285. The cubic root of 138833091 is about 517.8027242308.

The spelling of 138833091 in words is "one hundred thirty-eight million, eight hundred thirty-three thousand, ninety-one".