138237851 has 2 divisors, whose sum is σ = 138237852. Its totient is φ = 138237850.

The previous prime is 138237823. The next prime is 138237877. The reversal of 138237851 is 158732831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138237851 - 2¹⁰ = 138236827 is a prime.

It is not a weakly prime, because it can be changed into another prime (138237811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69118925 + 69118926.

It is an arithmetic number, because the mean of its divisors is an integer number (69118926).

Almost surely, 2^138237851 is an apocalyptic number.

138237851 is a deficient number, since it is larger than the sum of its proper divisors (1).

138237851 is an equidigital number, since it uses as much as digits as its factorization.

138237851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 138237851 is about 11757.4593769232. The cubic root of 138237851 is about 517.0616462650.

The spelling of 138237851 in words is "one hundred thirty-eight million, two hundred thirty-seven thousand, eight hundred fifty-one".