361790021 has 4 divisors (see below), whose sum is σ = 361965792. Its totient is φ = 361614252.

The previous prime is 361789927. The next prime is 361790047. The reversal of 361790021 is 120097163.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120097163 = 17 ⋅7064539.

It is a cyclic number.

It is not a de Polignac number, because 361790021 - 2²⁶ = 294681157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361790081) 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 3 ways as a sum of consecutive naturals, for example, 84761 + ... + 88926.

It is an arithmetic number, because the mean of its divisors is an integer number (90491448).

Almost surely, 2^361790021 is an apocalyptic number.

It is an amenable number.

361790021 is a deficient number, since it is larger than the sum of its proper divisors (175771).

361790021 is a wasteful number, since it uses less digits than its factorization.

361790021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175770.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 361790021 is about 19020.7786643975. The cubic root of 361790021 is about 712.5557701703. Note that the first 3 decimals are identical.

The spelling of 361790021 in words is "three hundred sixty-one million, seven hundred ninety thousand, twenty-one".