908561161 has 4 divisors (see below), whose sum is σ = 910958800. Its totient is φ = 906163524.

The previous prime is 908561153. The next prime is 908561177. The reversal of 908561161 is 161165809.

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 908561161 - 2³ = 908561153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 908561161.

It is not an unprimeable number, because it can be changed into a prime (908561131) 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, 1198251 + ... + 1199008.

It is an arithmetic number, because the mean of its divisors is an integer number (227739700).

Almost surely, 2^908561161 is an apocalyptic number.

It is an amenable number.

908561161 is a deficient number, since it is larger than the sum of its proper divisors (2397639).

908561161 is a wasteful number, since it uses less digits than its factorization.

908561161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397638.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 908561161 is about 30142.3482993611. The cubic root of 908561161 is about 968.5411026730.

The spelling of 908561161 in words is "nine hundred eight million, five hundred sixty-one thousand, one hundred sixty-one".