138602531 has 4 divisors (see below), whose sum is σ = 144628752. Its totient is φ = 132576312.

The previous prime is 138602521. The next prime is 138602533. The reversal of 138602531 is 135206831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138602531 - 2⁶ = 138602467 is a prime.

It is a super-2 number, since 2×138602531² = 38421323199211922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138602494 and 138602503.

It is not an unprimeable number, because it can be changed into a prime (138602533) 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, 3013076 + ... + 3013121.

It is an arithmetic number, because the mean of its divisors is an integer number (36157188).

Almost surely, 2^138602531 is an apocalyptic number.

138602531 is a deficient number, since it is larger than the sum of its proper divisors (6026221).

138602531 is an equidigital number, since it uses as much as digits as its factorization.

138602531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6026220.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 138602531 is about 11772.9576148052. The cubic root of 138602531 is about 517.5159272250.

The spelling of 138602531 in words is "one hundred thirty-eight million, six hundred two thousand, five hundred thirty-one".