136621601 has 4 divisors (see below), whose sum is σ = 136654212. Its totient is φ = 136588992.

The previous prime is 136621591. The next prime is 136621607. The reversal of 136621601 is 106126631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21381376 + 115240225 = 4624^2 + 10735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136621601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136621607) 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, 8900 + ... + 18773.

It is an arithmetic number, because the mean of its divisors is an integer number (34163553).

Almost surely, 2^136621601 is an apocalyptic number.

It is an amenable number.

136621601 is a deficient number, since it is larger than the sum of its proper divisors (32611).

136621601 is an equidigital number, since it uses as much as digits as its factorization.

136621601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32610.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 136621601 is about 11688.5243294438. The cubic root of 136621601 is about 515.0386133740.

The spelling of 136621601 in words is "one hundred thirty-six million, six hundred twenty-one thousand, six hundred one".