138917651 has 2 divisors, whose sum is σ = 138917652. Its totient is φ = 138917650.

The previous prime is 138917641. The next prime is 138917657. The reversal of 138917651 is 156719831.

138917651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138917651 - 2²⁶ = 71808787 is a prime.

It is a super-2 number, since 2×138917651² = 38596227518715602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138917599 and 138917608.

It is not a weakly prime, because it can be changed into another prime (138917657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69458825 + 69458826.

It is an arithmetic number, because the mean of its divisors is an integer number (69458826).

Almost surely, 2^138917651 is an apocalyptic number.

138917651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138917651 is an equidigital number, since it uses as much as digits as its factorization.

138917651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 138917651 is about 11786.3332296351. Note that the first 3 decimals coincide. The cubic root of 138917651 is about 517.9078300849.

The spelling of 138917651 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, six hundred fifty-one".