361874561 has 2 divisors, whose sum is σ = 361874562. Its totient is φ = 361874560.

The previous prime is 361874549. The next prime is 361874581. The reversal of 361874561 is 165478163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356492161 + 5382400 = 18881^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 361874561 - 2¹⁰ = 361873537 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (361874581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180937280 + 180937281.

It is an arithmetic number, because the mean of its divisors is an integer number (180937281).

Almost surely, 2^361874561 is an apocalyptic number.

It is an amenable number.

361874561 is a deficient number, since it is larger than the sum of its proper divisors (1).

361874561 is an equidigital number, since it uses as much as digits as its factorization.

361874561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 361874561 is about 19023.0008410871. Note that the first 3 decimals coincide. The cubic root of 361874561 is about 712.6112671620.

The spelling of 361874561 in words is "three hundred sixty-one million, eight hundred seventy-four thousand, five hundred sixty-one".