136898681 has 2 divisors, whose sum is σ = 136898682. Its totient is φ = 136898680.

The previous prime is 136898651. The next prime is 136898711. The reversal of 136898681 is 186898631.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (136898651) and next prime (136898711).

It can be written as a sum of positive squares in only one way, i.e., 115369081 + 21529600 = 10741^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 136898681 - 2¹⁴ = 136882297 is a prime.

It is a super-2 number, since 2×136898681² = 37482497719079522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136898611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68449340 + 68449341.

It is an arithmetic number, because the mean of its divisors is an integer number (68449341).

Almost surely, 2^136898681 is an apocalyptic number.

It is an amenable number.

136898681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136898681 is an equidigital number, since it uses as much as digits as its factorization.

136898681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 136898681 is about 11700.3709770246. The cubic root of 136898681 is about 515.3865586786.

Subtracting from 136898681 its sum of digits (50), we obtain a palindrome (136898631).

The spelling of 136898681 in words is "one hundred thirty-six million, eight hundred ninety-eight thousand, six hundred eighty-one".