361609 has 4 divisors (see below), whose sum is σ = 362880. Its totient is φ = 360340.

The previous prime is 361577. The next prime is 361637. The reversal of 361609 is 906163.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 906163 = 29 ⋅31247.

It is a cyclic number.

It is not a de Polignac number, because 361609 - 2⁵ = 361577 is a prime.

It is a super-2 number, since 2×361609² = 261522137762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (361649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2³⁶¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

361609 is a deficient number, since it is larger than the sum of its proper divisors (1271).

361609 is an equidigital number, since it uses as much as digits as its factorization.

361609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 361609 is about 601.3393384770. The cubic root of 361609 is about 71.2436908336.

The spelling of 361609 in words is "three hundred sixty-one thousand, six hundred nine".