361808641 has 4 divisors (see below), whose sum is σ = 370633284. Its totient is φ = 352984000.

The previous prime is 361808627. The next prime is 361808693. The reversal of 361808641 is 146808163.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146808163 = 131 ⋅1120673.

It can be written as a sum of positive squares in 2 ways, for example, as 190329616 + 171479025 = 13796^2 + 13095^2 .

It is a cyclic number.

It is not a de Polignac number, because 361808641 - 2⁵ = 361808609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 361808641.

It is not an unprimeable number, because it can be changed into a prime (361808341) 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, 4412260 + ... + 4412341.

It is an arithmetic number, because the mean of its divisors is an integer number (92658321).

Almost surely, 2^361808641 is an apocalyptic number.

It is an amenable number.

361808641 is a deficient number, since it is larger than the sum of its proper divisors (8824643).

361808641 is an equidigital number, since it uses as much as digits as its factorization.

361808641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8824642.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 361808641 is about 19021.2681228145. The cubic root of 361808641 is about 712.5679941677.

The spelling of 361808641 in words is "three hundred sixty-one million, eight hundred eight thousand, six hundred forty-one".