138232961 has 8 divisors (see below), whose sum is σ = 145669920. Its totient is φ = 130812192.

The previous prime is 138232949. The next prime is 138232981. The reversal of 138232961 is 169232831.

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

It is a cyclic number.

It is not a de Polignac number, because 138232961 - 2¹⁰ = 138231937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138232981) 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, 16106 + ... + 23148.

It is an arithmetic number, because the mean of its divisors is an integer number (18208740).

Almost surely, 2^138232961 is an apocalyptic number.

It is an amenable number.

138232961 is a deficient number, since it is larger than the sum of its proper divisors (7436959).

138232961 is a wasteful number, since it uses less digits than its factorization.

138232961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8095.

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

The square root of 138232961 is about 11757.2514219949. The cubic root of 138232961 is about 517.0555493790.

It can be divided in two parts, 1382 and 32961, that added together give a palindrome (34343).

The spelling of 138232961 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, nine hundred sixty-one".