138598613 has 4 divisors (see below), whose sum is σ = 143069568. Its totient is φ = 134127660.

The previous prime is 138598609. The next prime is 138598631. The reversal of 138598613 is 316895831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 316895831 = 7 ⋅45270833.

It is a cyclic number.

It is not a de Polignac number, because 138598613 - 2² = 138598609 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 (138598693) 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, 2235431 + ... + 2235492.

It is an arithmetic number, because the mean of its divisors is an integer number (35767392).

Almost surely, 2^138598613 is an apocalyptic number.

It is an amenable number.

138598613 is a deficient number, since it is larger than the sum of its proper divisors (4470955).

138598613 is an equidigital number, since it uses as much as digits as its factorization.

138598613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470954.

The product of its digits is 155520, while the sum is 44.

The square root of 138598613 is about 11772.7912153406. The cubic root of 138598613 is about 517.5110508193.

The spelling of 138598613 in words is "one hundred thirty-eight million, five hundred ninety-eight thousand, six hundred thirteen".