136880993 has 4 divisors (see below), whose sum is σ = 137206548. Its totient is φ = 136555440.

The previous prime is 136880987. The next prime is 136881007. The reversal of 136880993 is 399088631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399088631 = 1321 ⋅302111.

It can be written as a sum of positive squares in 2 ways, for example, as 44182609 + 92698384 = 6647^2 + 9628^2 .

It is a cyclic number.

It is not a de Polignac number, because 136880993 - 2¹⁸ = 136618849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136880893) 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, 162146 + ... + 162987.

It is an arithmetic number, because the mean of its divisors is an integer number (34301637).

Almost surely, 2^136880993 is an apocalyptic number.

It is an amenable number.

136880993 is a deficient number, since it is larger than the sum of its proper divisors (325555).

136880993 is an equidigital number, since it uses as much as digits as its factorization.

136880993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325554.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 136880993 is about 11699.6150791383. The cubic root of 136880993 is about 515.3643608750.

The spelling of 136880993 in words is "one hundred thirty-six million, eight hundred eighty thousand, nine hundred ninety-three".