903661 has 8 divisors (see below), whose sum is σ = 995904. Its totient is φ = 813120.

The previous prime is 903649. The next prime is 903673. The reversal of 903661 is 166309.

It is an interprime number because it is at equal distance from previous prime (903649) and next prime (903673).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 903661 - 2¹¹ = 901613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (903641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2⁹⁰³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

903661 is a deficient number, since it is larger than the sum of its proper divisors (92243).

903661 is a wasteful number, since it uses less digits than its factorization.

903661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

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

The square root of 903661 is about 950.6108562393. The cubic root of 903661 is about 96.6796745608.

The spelling of 903661 in words is "nine hundred three thousand, six hundred sixty-one".