136391797 has 4 divisors (see below), whose sum is σ = 137797996. Its totient is φ = 134985600.

The previous prime is 136391741. The next prime is 136391819. The reversal of 136391797 is 797193631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52504516 + 83887281 = 7246^2 + 9159^2 .

It is a cyclic number.

It is not a de Polignac number, because 136391797 - 2¹¹ = 136389749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136391597) 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, 702954 + ... + 703147.

It is an arithmetic number, because the mean of its divisors is an integer number (34449499).

Almost surely, 2^136391797 is an apocalyptic number.

It is an amenable number.

136391797 is a deficient number, since it is larger than the sum of its proper divisors (1406199).

136391797 is an equidigital number, since it uses as much as digits as its factorization.

136391797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406198.

The product of its digits is 214326, while the sum is 46.

The square root of 136391797 is about 11678.6898665903. The cubic root of 136391797 is about 514.7496782033.

The spelling of 136391797 in words is "one hundred thirty-six million, three hundred ninety-one thousand, seven hundred ninety-seven".