363661 has 4 divisors (see below), whose sum is σ = 375424. Its totient is φ = 351900.

The previous prime is 363659. The next prime is 363677. The reversal of 363661 is 166363.

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.

It is a cyclic number.

It is not a de Polignac number, because 363661 - 2¹ = 363659 is a prime.

It is a Duffinian number.

363661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (363611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5835 + ... + 5896.

It is an arithmetic number, because the mean of its divisors is an integer number (93856).

2³⁶³⁶⁶¹ is an apocalyptic number.

363661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

363661 is a deficient number, since it is larger than the sum of its proper divisors (11763).

363661 is a wasteful number, since it uses less digits than its factorization.

363661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11762.

The product of its digits is 1944, while the sum is 25.

The square root of 363661 is about 603.0431162031. The cubic root of 363661 is about 71.3781974352.

It can be divided in two parts, 363 and 661, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 363661 in words is "three hundred sixty-three thousand, six hundred sixty-one".