361561 has 2 divisors, whose sum is σ = 361562. Its totient is φ = 361560.

The previous prime is 361549. The next prime is 361577. The reversal of 361561 is 165163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 47961 = 560^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 361561 - 2⁷ = 361433 is a prime.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (361511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180780 + 180781.

It is an arithmetic number, because the mean of its divisors is an integer number (180781).

2³⁶¹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

361561 is a deficient number, since it is larger than the sum of its proper divisors (1).

361561 is an equidigital number, since it uses as much as digits as its factorization.

361561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 361561 is about 601.2994262429. The cubic root of 361561 is about 71.2405383968.

The spelling of 361561 in words is "three hundred sixty-one thousand, five hundred sixty-one".