138571751 has 2 divisors, whose sum is σ = 138571752. Its totient is φ = 138571750.

The previous prime is 138571747. The next prime is 138571781. The reversal of 138571751 is 157175831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138571751 - 2² = 138571747 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138571721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69285875 + 69285876.

It is an arithmetic number, because the mean of its divisors is an integer number (69285876).

Almost surely, 2^138571751 is an apocalyptic number.

138571751 is a deficient number, since it is larger than the sum of its proper divisors (1).

138571751 is an equidigital number, since it uses as much as digits as its factorization.

138571751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 38.

The square root of 138571751 is about 11771.6503091113. The cubic root of 138571751 is about 517.4776154678.

The spelling of 138571751 in words is "one hundred thirty-eight million, five hundred seventy-one thousand, seven hundred fifty-one".