136374721 has 4 divisors (see below), whose sum is σ = 155856832. Its totient is φ = 116892612.

The previous prime is 136374709. The next prime is 136374743. The reversal of 136374721 is 127473631.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127473631 = 2357 ⋅54083.

It is a cyclic number.

It is not a de Polignac number, because 136374721 - 2¹¹ = 136372673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136375721) 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, 9741045 + ... + 9741058.

It is an arithmetic number, because the mean of its divisors is an integer number (38964208).

Almost surely, 2^136374721 is an apocalyptic number.

It is an amenable number.

136374721 is a deficient number, since it is larger than the sum of its proper divisors (19482111).

136374721 is an equidigital number, since it uses as much as digits as its factorization.

136374721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19482110.

The product of its digits is 21168, while the sum is 34.

The square root of 136374721 is about 11677.9587685520. The cubic root of 136374721 is about 514.7281954051.

The spelling of 136374721 in words is "one hundred thirty-six million, three hundred seventy-four thousand, seven hundred twenty-one".