136061721 has 32 divisors (see below), whose sum is σ = 211875840. Its totient is φ = 86130000.

The previous prime is 136061713. The next prime is 136061741. The reversal of 136061721 is 127160631.

It is not a de Polignac number, because 136061721 - 2³ = 136061713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (136061701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93046 + ... + 94496.

It is an arithmetic number, because the mean of its divisors is an integer number (6621120).

Almost surely, 2^136061721 is an apocalyptic number.

It is an amenable number.

136061721 is a deficient number, since it is larger than the sum of its proper divisors (75814119).

136061721 is a wasteful number, since it uses less digits than its factorization.

136061721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 136061721 is about 11664.5497555628. The cubic root of 136061721 is about 514.3341014989.

The spelling of 136061721 in words is "one hundred thirty-six million, sixty-one thousand, seven hundred twenty-one".