971608561 has 16 divisors (see below), whose sum is σ = 1234217088. Its totient is φ = 742809600.

The previous prime is 971608553. The next prime is 971608577. The reversal of 971608561 is 165806179.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 971608561 - 2³ = 971608553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971608501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114960 + ... + 123121.

It is an arithmetic number, because the mean of its divisors is an integer number (77138568).

Almost surely, 2^971608561 is an apocalyptic number.

It is an amenable number.

971608561 is a deficient number, since it is larger than the sum of its proper divisors (262608527).

971608561 is a wasteful number, since it uses less digits than its factorization.

971608561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238152.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 971608561 is about 31170.6361981914. The cubic root of 971608561 is about 990.4451832442.

The spelling of 971608561 in words is "nine hundred seventy-one million, six hundred eight thousand, five hundred sixty-one".