361005561 has 12 divisors (see below), whose sum is σ = 595945792. Its totient is φ = 206288856.

The previous prime is 361005553. The next prime is 361005563. The reversal of 361005561 is 165500163.

It is a happy number.

361005561 is a `hidden beast` number, since 3 + 6 + 100 + 556 + 1 = 666.

It is not a de Polignac number, because 361005561 - 2³ = 361005553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361005563) 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 11 ways as a sum of consecutive naturals, for example, 2865061 + ... + 2865186.

Almost surely, 2^361005561 is an apocalyptic number.

It is an amenable number.

361005561 is a deficient number, since it is larger than the sum of its proper divisors (234940231).

361005561 is a wasteful number, since it uses less digits than its factorization.

361005561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5730260 (or 5730257 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 361005561 is about 19000.1463415417. The cubic root of 361005561 is about 712.0403920453.

The spelling of 361005561 in words is "three hundred sixty-one million, five thousand, five hundred sixty-one".