138281751 has 12 divisors (see below), whose sum is σ = 199896840. Its totient is φ = 92115600.

The previous prime is 138281747. The next prime is 138281761. The reversal of 138281751 is 157182831.

It is not a de Polignac number, because 138281751 - 2² = 138281747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138281701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7765 + ... + 18353.

It is an arithmetic number, because the mean of its divisors is an integer number (16658070).

Almost surely, 2^138281751 is an apocalyptic number.

138281751 is a deficient number, since it is larger than the sum of its proper divisors (61615089).

138281751 is a wasteful number, since it uses less digits than its factorization.

138281751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12046 (or 12043 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 138281751 is about 11759.3261286521. The cubic root of 138281751 is about 517.1163746521.

The spelling of 138281751 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, seven hundred fifty-one".