136780681 has 4 divisors (see below), whose sum is σ = 136807552. Its totient is φ = 136753812.

The previous prime is 136780673. The next prime is 136780729. The reversal of 136780681 is 186087631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 136780681 - 2³ = 136780673 is a prime.

It is a super-2 number, since 2×136780681² = 37417909389647522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136780621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3201 + ... + 16846.

It is an arithmetic number, because the mean of its divisors is an integer number (34201888).

Almost surely, 2^136780681 is an apocalyptic number.

It is an amenable number.

136780681 is a deficient number, since it is larger than the sum of its proper divisors (26871).

136780681 is an equidigital number, since it uses as much as digits as its factorization.

136780681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26870.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 136780681 is about 11695.3273147869. The cubic root of 136780681 is about 515.2384367361.

The spelling of 136780681 in words is "one hundred thirty-six million, seven hundred eighty thousand, six hundred eighty-one".