138425537 has 2 divisors, whose sum is σ = 138425538. Its totient is φ = 138425536.

The previous prime is 138425519. The next prime is 138425549. The reversal of 138425537 is 735524831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135862336 + 2563201 = 11656^2 + 1601^2 .

It is a cyclic number.

It is not a de Polignac number, because 138425537 - 2¹⁰ = 138424513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138425537.

It is not a weakly prime, because it can be changed into another prime (138425737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69212768 + 69212769.

It is an arithmetic number, because the mean of its divisors is an integer number (69212769).

Almost surely, 2^138425537 is an apocalyptic number.

It is an amenable number.

138425537 is a deficient number, since it is larger than the sum of its proper divisors (1).

138425537 is an equidigital number, since it uses as much as digits as its factorization.

138425537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 138425537 is about 11765.4382408816. The cubic root of 138425537 is about 517.2955458928.

The spelling of 138425537 in words is "one hundred thirty-eight million, four hundred twenty-five thousand, five hundred thirty-seven".