136780001 has 4 divisors (see below), whose sum is σ = 136903572. Its totient is φ = 136656432.

The previous prime is 136779989. The next prime is 136780051. The reversal of 136780001 is 100087631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100087631 = 7 ⋅14298233.

It can be written as a sum of positive squares in 2 ways, for example, as 30195025 + 106584976 = 5495^2 + 10324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136780001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136780051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60110 + ... + 62343.

It is an arithmetic number, because the mean of its divisors is an integer number (34225893).

Almost surely, 2^136780001 is an apocalyptic number.

It is an amenable number.

136780001 is a deficient number, since it is larger than the sum of its proper divisors (123571).

136780001 is a wasteful number, since it uses less digits than its factorization.

136780001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123570.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 136780001 is about 11695.2982433113. The cubic root of 136780001 is about 515.2375829052.

The spelling of 136780001 in words is "one hundred thirty-six million, seven hundred eighty thousand, one".