138774851 has 2 divisors, whose sum is σ = 138774852. Its totient is φ = 138774850.

The previous prime is 138774809. The next prime is 138774863. The reversal of 138774851 is 158477831.

It is a strong prime.

It is an emirp because it is prime and its reverse (158477831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138774851 - 2⁶ = 138774787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138774871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69387425 + 69387426.

It is an arithmetic number, because the mean of its divisors is an integer number (69387426).

Almost surely, 2^138774851 is an apocalyptic number.

138774851 is a deficient number, since it is larger than the sum of its proper divisors (1).

138774851 is an equidigital number, since it uses as much as digits as its factorization.

138774851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 44.

The square root of 138774851 is about 11780.2738083629. The cubic root of 138774851 is about 517.7303086217.

The spelling of 138774851 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred fifty-one".