136951921 has 4 divisors (see below), whose sum is σ = 139273200. Its totient is φ = 134630644.

The previous prime is 136951901. The next prime is 136951939. The reversal of 136951921 is 129159631.

It is a happy number.

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 136951921 - 2¹¹ = 136949873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136951901) 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, 1160551 + ... + 1160668.

It is an arithmetic number, because the mean of its divisors is an integer number (34818300).

Almost surely, 2^136951921 is an apocalyptic number.

It is an amenable number.

136951921 is a deficient number, since it is larger than the sum of its proper divisors (2321279).

136951921 is an equidigital number, since it uses as much as digits as its factorization.

136951921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321278.

The product of its digits is 14580, while the sum is 37.

The square root of 136951921 is about 11702.6458974029. The cubic root of 136951921 is about 515.4533614262.

The spelling of 136951921 in words is "one hundred thirty-six million, nine hundred fifty-one thousand, nine hundred twenty-one".