909661 has 4 divisors (see below), whose sum is σ = 911872. Its totient is φ = 907452.

The previous prime is 909637. The next prime is 909679. The reversal of 909661 is 166909.

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 909661 - 2¹⁵ = 876893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 909661.

It is not an unprimeable number, because it can be changed into a prime (909611) 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, 285 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (227968).

2⁹⁰⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

909661 is a deficient number, since it is larger than the sum of its proper divisors (2211).

909661 is a wasteful number, since it uses less digits than its factorization.

909661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 909661 is about 953.7615005860. The cubic root of 909661 is about 96.8931760554.

The spelling of 909661 in words is "nine hundred nine thousand, six hundred sixty-one".