138813501 has 4 divisors (see below), whose sum is σ = 185084672. Its totient is φ = 92542332.

The previous prime is 138813473. The next prime is 138813509. The reversal of 138813501 is 105318831.

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 not a de Polignac number, because 138813501 - 2²⁶ = 71704637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138813509) 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, 23135581 + ... + 23135586.

It is an arithmetic number, because the mean of its divisors is an integer number (46271168).

Almost surely, 2^138813501 is an apocalyptic number.

It is an amenable number.

138813501 is a deficient number, since it is larger than the sum of its proper divisors (46271171).

138813501 is an equidigital number, since it uses as much as digits as its factorization.

138813501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46271170.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 138813501 is about 11781.9141483886. The cubic root of 138813501 is about 517.7783682879.

The spelling of 138813501 in words is "one hundred thirty-eight million, eight hundred thirteen thousand, five hundred one".