136940621 has 4 divisors (see below), whose sum is σ = 138590592. Its totient is φ = 135290652.

The previous prime is 136940599. The next prime is 136940647. The reversal of 136940621 is 126049631.

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 136940621 - 2¹⁴ = 136924237 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 (136940521) 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, 824861 + ... + 825026.

It is an arithmetic number, because the mean of its divisors is an integer number (34647648).

Almost surely, 2^136940621 is an apocalyptic number.

It is an amenable number.

136940621 is a deficient number, since it is larger than the sum of its proper divisors (1649971).

136940621 is an equidigital number, since it uses as much as digits as its factorization.

136940621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649970.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 136940621 is about 11702.1630906427. The cubic root of 136940621 is about 515.4391842290.

The spelling of 136940621 in words is "one hundred thirty-six million, nine hundred forty thousand, six hundred twenty-one".