361909 has 2 divisors, whose sum is σ = 361910. Its totient is φ = 361908.

The previous prime is 361903. The next prime is 361919. The reversal of 361909 is 909163.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253009 + 108900 = 503^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 361909 - 2³ = 361901 is a prime.

It is an Ulam number.

361909 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (361901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180954 + 180955.

It is an arithmetic number, because the mean of its divisors is an integer number (180955).

2³⁶¹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

361909 is a deficient number, since it is larger than the sum of its proper divisors (1).

361909 is an equidigital number, since it uses as much as digits as its factorization.

361909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 361909 is about 601.5887299476. The cubic root of 361909 is about 71.2633872454.

The spelling of 361909 in words is "three hundred sixty-one thousand, nine hundred nine".