138173631 has 8 divisors (see below), whose sum is σ = 186981504. Its totient is φ = 90740760.

The previous prime is 138173621. The next prime is 138173641. The reversal of 138173631 is 136371831.

It is an interprime number because it is at equal distance from previous prime (138173621) and next prime (138173641).

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

It is not a de Polignac number, because 138173631 - 2²² = 133979327 is a prime.

It is a super-2 number, since 2×138173631² = 38183904607448322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138173592 and 138173601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138173611) 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, 343515 + ... + 343916.

It is an arithmetic number, because the mean of its divisors is an integer number (23372688).

Almost surely, 2^138173631 is an apocalyptic number.

138173631 is a deficient number, since it is larger than the sum of its proper divisors (48807873).

138173631 is an equidigital number, since it uses as much as digits as its factorization.

138173631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687501.

The product of its digits is 9072, while the sum is 33.

The square root of 138173631 is about 11754.7280274790. The cubic root of 138173631 is about 516.9815648641.

The spelling of 138173631 in words is "one hundred thirty-eight million, one hundred seventy-three thousand, six hundred thirty-one".