138525731 has 4 divisors (see below), whose sum is σ = 139820472. Its totient is φ = 137230992.

The previous prime is 138525719. The next prime is 138525733. The reversal of 138525731 is 137525831.

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 138525731 - 2¹⁴ = 138509347 is a prime.

It is a super-2 number, since 2×138525731² = 38378756298168722, 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 = 138525691 and 138525700.

It is not an unprimeable number, because it can be changed into a prime (138525733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647210 + ... + 647423.

It is an arithmetic number, because the mean of its divisors is an integer number (34955118).

Almost surely, 2^138525731 is an apocalyptic number.

138525731 is a deficient number, since it is larger than the sum of its proper divisors (1294741).

138525731 is a wasteful number, since it uses less digits than its factorization.

138525731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294740.

The product of its digits is 25200, while the sum is 35.

The square root of 138525731 is about 11769.6954506053. The cubic root of 138525731 is about 517.4203239529.

The spelling of 138525731 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, seven hundred thirty-one".