138751751 has 4 divisors (see below), whose sum is σ = 138776904. Its totient is φ = 138726600.

The previous prime is 138751741. The next prime is 138751817. The reversal of 138751751 is 157157831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157157831 = 73 ⋅2152847.

It is a cyclic number.

It is not a de Polignac number, because 138751751 - 2⁶ = 138751687 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 (138751741) 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, 320 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (34694226).

Almost surely, 2^138751751 is an apocalyptic number.

138751751 is a deficient number, since it is larger than the sum of its proper divisors (25153).

138751751 is an equidigital number, since it uses as much as digits as its factorization.

138751751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25152.

The product of its digits is 29400, while the sum is 38.

The square root of 138751751 is about 11779.2933149659. The cubic root of 138751751 is about 517.7015804728.

The spelling of 138751751 in words is "one hundred thirty-eight million, seven hundred fifty-one thousand, seven hundred fifty-one".