361806721 has 16 divisors (see below), whose sum is σ = 400112640. Its totient is φ = 325630800.

The previous prime is 361806701. The next prime is 361806737. The reversal of 361806721 is 127608163.

It is a cyclic number.

It is not a de Polignac number, because 361806721 - 2⁵ = 361806689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (361806701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63246 + ... + 68728.

It is an arithmetic number, because the mean of its divisors is an integer number (25007040).

Almost surely, 2^361806721 is an apocalyptic number.

It is an amenable number.

361806721 is a deficient number, since it is larger than the sum of its proper divisors (38305919).

361806721 is a wasteful number, since it uses less digits than its factorization.

361806721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 361806721 is about 19021.2176529264. The cubic root of 361806721 is about 712.5667337104.

The spelling of 361806721 in words is "three hundred sixty-one million, eight hundred six thousand, seven hundred twenty-one".