138605351 has 4 divisors (see below), whose sum is σ = 139406712. Its totient is φ = 137803992.

The previous prime is 138605287. The next prime is 138605377. The reversal of 138605351 is 153506831.

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 138605351 - 2⁶ = 138605287 is a prime.

It is a super-2 number, since 2×138605351² = 38422886651666402, which contains 22 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 (138605251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400421 + ... + 400766.

It is an arithmetic number, because the mean of its divisors is an integer number (34851678).

Almost surely, 2^138605351 is an apocalyptic number.

138605351 is a deficient number, since it is larger than the sum of its proper divisors (801361).

138605351 is an equidigital number, since it uses as much as digits as its factorization.

138605351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801360.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 138605351 is about 11773.0773801925. The cubic root of 138605351 is about 517.5194369853.

The spelling of 138605351 in words is "one hundred thirty-eight million, six hundred five thousand, three hundred fifty-one".