361790721 has 6 divisors (see below), whose sum is σ = 522586610. Its totient is φ = 241193808.

The previous prime is 361790717. The next prime is 361790749. The reversal of 361790721 is 127097163.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 239909121 + 121881600 = 15489^2 + 11040^2 .

It is not a de Polignac number, because 361790721 - 2² = 361790717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361790711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20099476 + ... + 20099493.

Almost surely, 2^361790721 is an apocalyptic number.

It is an amenable number.

361790721 is a deficient number, since it is larger than the sum of its proper divisors (160795889).

361790721 is a wasteful number, since it uses less digits than its factorization.

361790721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40198975 (or 40198972 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 361790721 is about 19020.7970653177. The cubic root of 361790721 is about 712.5562297267.

The spelling of 361790721 in words is "three hundred sixty-one million, seven hundred ninety thousand, seven hundred twenty-one".