136998839 has 2 divisors, whose sum is σ = 136998840. Its totient is φ = 136998838.

The previous prime is 136998821. The next prime is 136998859. The reversal of 136998839 is 938899631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136998839 - 2¹² = 136994743 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136998809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68499419 + 68499420.

It is an arithmetic number, because the mean of its divisors is an integer number (68499420).

Almost surely, 2^136998839 is an apocalyptic number.

136998839 is a deficient number, since it is larger than the sum of its proper divisors (1).

136998839 is an equidigital number, since it uses as much as digits as its factorization.

136998839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 136998839 is about 11704.6503151525. The cubic root of 136998839 is about 515.5122173114.

The spelling of 136998839 in words is "one hundred thirty-six million, nine hundred ninety-eight thousand, eight hundred thirty-nine".