138088961 has 8 divisors (see below), whose sum is σ = 141208704. Its totient is φ = 134976880.

The previous prime is 138088949. The next prime is 138088963. The reversal of 138088961 is 169880831.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138088961 is a prime.

It is a super-2 number, since 2×138088961² = 38137122300119042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138088963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49931 + ... + 52623.

It is an arithmetic number, because the mean of its divisors is an integer number (17651088).

Almost surely, 2^138088961 is an apocalyptic number.

It is an amenable number.

138088961 is a deficient number, since it is larger than the sum of its proper divisors (3119743).

138088961 is a wasteful number, since it uses less digits than its factorization.

138088961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 138088961 is about 11751.1259460530. The cubic root of 138088961 is about 516.8759446797.

The spelling of 138088961 in words is "one hundred thirty-eight million, eighty-eight thousand, nine hundred sixty-one".