138764551 has 2 divisors, whose sum is σ = 138764552. Its totient is φ = 138764550.

The previous prime is 138764537. The next prime is 138764567. The reversal of 138764551 is 155467831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (155467831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138764551 - 2⁹ = 138764039 is a prime.

It is a super-2 number, since 2×138764551² = 38511201228463202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138564551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69382275 + 69382276.

It is an arithmetic number, because the mean of its divisors is an integer number (69382276).

Almost surely, 2^138764551 is an apocalyptic number.

138764551 is a deficient number, since it is larger than the sum of its proper divisors (1).

138764551 is an equidigital number, since it uses as much as digits as its factorization.

138764551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 138764551 is about 11779.8366287483. The cubic root of 138764551 is about 517.7174994946.

The spelling of 138764551 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, five hundred fifty-one".