908561 has 4 divisors (see below), whose sum is σ = 956400. Its totient is φ = 860724.

The previous prime is 908549. The next prime is 908573. The reversal of 908561 is 165809.

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 an emirpimes, since its reverse is a distinct semiprime: 165809 = 7 ⋅23687.

It is an interprime number because it is at equal distance from previous prime (908549) and next prime (908573).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-908561 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (908521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23891 + ... + 23928.

It is an arithmetic number, because the mean of its divisors is an integer number (239100).

2⁹⁰⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

908561 is a deficient number, since it is larger than the sum of its proper divisors (47839).

908561 is a wasteful number, since it uses less digits than its factorization.

908561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47838.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 908561 is about 953.1846620671. The cubic root of 908561 is about 96.8541045463.

The spelling of 908561 in words is "nine hundred eight thousand, five hundred sixty-one".