138081787 has 2 divisors, whose sum is σ = 138081788. Its totient is φ = 138081786.

The previous prime is 138081767. The next prime is 138081833. The reversal of 138081787 is 787180831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (787180831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138081787 - 2²⁷ = 3864059 is a prime.

It is a super-3 number, since 3×138081787³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (138081737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69040893 + 69040894.

It is an arithmetic number, because the mean of its divisors is an integer number (69040894).

Almost surely, 2^138081787 is an apocalyptic number.

138081787 is a deficient number, since it is larger than the sum of its proper divisors (1).

138081787 is an equidigital number, since it uses as much as digits as its factorization.

138081787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 43.

The square root of 138081787 is about 11750.8206947430. The cubic root of 138081787 is about 516.8669936088.

The spelling of 138081787 in words is "one hundred thirty-eight million, eighty-one thousand, seven hundred eighty-seven".