136694921 has 4 divisors (see below), whose sum is σ = 149121744. Its totient is φ = 124268100.

The previous prime is 136694881. The next prime is 136694923. The reversal of 136694921 is 129496631.

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 not a de Polignac number, because 136694921 - 2¹⁰ = 136693897 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 (136694923) 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, 6213395 + ... + 6213416.

It is an arithmetic number, because the mean of its divisors is an integer number (37280436).

Almost surely, 2^136694921 is an apocalyptic number.

136694921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136694921 is a deficient number, since it is larger than the sum of its proper divisors (12426823).

136694921 is a wasteful number, since it uses less digits than its factorization.

136694921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12426822.

The product of its digits is 69984, while the sum is 41.

The square root of 136694921 is about 11691.6603183637. The cubic root of 136694921 is about 515.1307312567.

The spelling of 136694921 in words is "one hundred thirty-six million, six hundred ninety-four thousand, nine hundred twenty-one".