138087013 has 4 divisors (see below), whose sum is σ = 138291660. Its totient is φ = 137882368.

The previous prime is 138087007. The next prime is 138087049. The reversal of 138087013 is 310780831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310780831 = 439 ⋅707929.

It can be written as a sum of positive squares in 2 ways, for example, as 110817729 + 27269284 = 10527^2 + 5222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138087013 is a prime.

It is a super-3 number, since 3×138087013³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138087913) 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, 101308 + ... + 102661.

It is an arithmetic number, because the mean of its divisors is an integer number (34572915).

Almost surely, 2^138087013 is an apocalyptic number.

It is an amenable number.

138087013 is a deficient number, since it is larger than the sum of its proper divisors (204647).

138087013 is an equidigital number, since it uses as much as digits as its factorization.

138087013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204646.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 138087013 is about 11751.0430600862. The cubic root of 138087013 is about 516.8735141714.

The spelling of 138087013 in words is "one hundred thirty-eight million, eighty-seven thousand, thirteen".