138525831 has 12 divisors (see below), whose sum is σ = 200251480. Its totient is φ = 92277360.

The previous prime is 138525823. The next prime is 138525841.

138525831 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 138525831 - 2³ = 138525823 is a prime.

It is a super-2 number, since 2×138525831² = 38378811708481122, 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 (138525841) 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, 7476 + ... + 18246.

Almost surely, 2^138525831 is an apocalyptic number.

138525831 is a deficient number, since it is larger than the sum of its proper divisors (61725649).

138525831 is a wasteful number, since it uses less digits than its factorization.

138525831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12206 (or 12203 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 138525831 is about 11769.6996988029. The cubic root of 138525831 is about 517.4204484593.

It can be divided in two parts, 13852 and 5831, that added together give a 9-th power (19683 = 3⁹).

The spelling of 138525831 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, eight hundred thirty-one".