138372692281 has 4 divisors (see below), whose sum is σ = 138817620864. Its totient is φ = 137927763700.

The previous prime is 138372692273. The next prime is 138372692287. The reversal of 138372692281 is 182296273831.

It is a happy number.

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 138372692281 - 2³ = 138372692273 is a prime.

It is a super-2 number, since 2×138372692281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138372692287) 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, 222463825 + ... + 222464446.

It is an arithmetic number, because the mean of its divisors is an integer number (34704405216).

Almost surely, 2^138372692281 is an apocalyptic number.

It is an amenable number.

138372692281 is a deficient number, since it is larger than the sum of its proper divisors (444928583).

138372692281 is an equidigital number, since it uses as much as digits as its factorization.

138372692281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444928582.

The product of its digits is 1741824, while the sum is 52.

The spelling of 138372692281 in words is "one hundred thirty-eight billion, three hundred seventy-two million, six hundred ninety-two thousand, two hundred eighty-one".