136779621 has 16 divisors (see below), whose sum is σ = 199817280. Its totient is φ = 82536320.

The previous prime is 136779611. The next prime is 136779623. The reversal of 136779621 is 126977631.

It is a cyclic number.

It is not a de Polignac number, because 136779621 - 2¹⁰ = 136778597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136779623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206 + ... + 16583.

It is an arithmetic number, because the mean of its divisors is an integer number (12488580).

Almost surely, 2^136779621 is an apocalyptic number.

136779621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136779621 is a deficient number, since it is larger than the sum of its proper divisors (63037659).

136779621 is a wasteful number, since it uses less digits than its factorization.

136779621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18036.

The product of its digits is 95256, while the sum is 42.

The square root of 136779621 is about 11695.2819974552. The cubic root of 136779621 is about 515.2371057631.

The spelling of 136779621 in words is "one hundred thirty-six million, seven hundred seventy-nine thousand, six hundred twenty-one".