136132721 has 8 divisors (see below), whose sum is σ = 138074880. Its totient is φ = 134196192.

The previous prime is 136132693. The next prime is 136132723. The reversal of 136132721 is 127231631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136132721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136132723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76781 + ... + 78533.

It is an arithmetic number, because the mean of its divisors is an integer number (17259360).

Almost surely, 2^136132721 is an apocalyptic number.

It is an amenable number.

136132721 is a deficient number, since it is larger than the sum of its proper divisors (1942159).

136132721 is an equidigital number, since it uses as much as digits as its factorization.

136132721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815.

The product of its digits is 1512, while the sum is 26.

The square root of 136132721 is about 11667.5927680049. The cubic root of 136132721 is about 514.4235495593.

The spelling of 136132721 in words is "one hundred thirty-six million, one hundred thirty-two thousand, seven hundred twenty-one".