136920813 has 4 divisors (see below), whose sum is σ = 182561088. Its totient is φ = 91280540.

The previous prime is 136920811. The next prime is 136920827. The reversal of 136920813 is 318029631.

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 136920813 - 2¹ = 136920811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136920811) 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, 22820133 + ... + 22820138.

It is an arithmetic number, because the mean of its divisors is an integer number (45640272).

Almost surely, 2^136920813 is an apocalyptic number.

It is an amenable number.

136920813 is a deficient number, since it is larger than the sum of its proper divisors (45640275).

136920813 is an equidigital number, since it uses as much as digits as its factorization.

136920813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45640274.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 136920813 is about 11701.3167207798. The cubic root of 136920813 is about 515.4143308495.

The spelling of 136920813 in words is "one hundred thirty-six million, nine hundred twenty thousand, eight hundred thirteen".