138102961 has 4 divisors (see below), whose sum is σ = 138653424. Its totient is φ = 137552500.

The previous prime is 138102947. The next prime is 138102977. The reversal of 138102961 is 169201831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138102961 - 2⁵ = 138102929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138102911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274855 + ... + 275356.

It is an arithmetic number, because the mean of its divisors is an integer number (34663356).

Almost surely, 2^138102961 is an apocalyptic number.

It is an amenable number.

138102961 is a deficient number, since it is larger than the sum of its proper divisors (550463).

138102961 is an equidigital number, since it uses as much as digits as its factorization.

138102961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550462.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 138102961 is about 11751.7216185544. The cubic root of 138102961 is about 516.8934117256.

The spelling of 138102961 in words is "one hundred thirty-eight million, one hundred two thousand, nine hundred sixty-one".