138787525 has 6 divisors (see below), whose sum is σ = 172096562. Its totient is φ = 111030000.

The previous prime is 138787489. The next prime is 138787547. The reversal of 138787525 is 525787831.

It can be written as a sum of positive squares in 3 ways, for example, as 45819361 + 92968164 = 6769^2 + 9642^2 .

It is not a de Polignac number, because 138787525 - 2⁹ = 138787013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2775726 + ... + 2775775.

Almost surely, 2^138787525 is an apocalyptic number.

It is an amenable number.

138787525 is a deficient number, since it is larger than the sum of its proper divisors (33309037).

138787525 is an equidigital number, since it uses as much as digits as its factorization.

138787525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551511 (or 5551506 counting only the distinct ones).

The product of its digits is 470400, while the sum is 46.

The square root of 138787525 is about 11780.8117292485. The cubic root of 138787525 is about 517.7460691964.

The spelling of 138787525 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, five hundred twenty-five".