138193651 has 2 divisors, whose sum is σ = 138193652. Its totient is φ = 138193650.

The previous prime is 138193621. The next prime is 138193667. The reversal of 138193651 is 156391831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138193651 - 2¹³ = 138185459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138193651.

It is not a weakly prime, because it can be changed into another prime (138193621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69096825 + 69096826.

It is an arithmetic number, because the mean of its divisors is an integer number (69096826).

Almost surely, 2^138193651 is an apocalyptic number.

138193651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138193651 is an equidigital number, since it uses as much as digits as its factorization.

138193651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 138193651 is about 11755.5795688686. The cubic root of 138193651 is about 517.0065321728.

The spelling of 138193651 in words is "one hundred thirty-eight million, one hundred ninety-three thousand, six hundred fifty-one".