971609869 has 4 divisors (see below), whose sum is σ = 983316096. Its totient is φ = 959903644.

The previous prime is 971609851. The next prime is 971609879. The reversal of 971609869 is 968906179.

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 a de Polignac number, because none of the positive numbers 2^k-971609869 is a prime.

It is a super-2 number, since 2×971609869² = 1888051475076394322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971609879) 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 3 ways as a sum of consecutive naturals, for example, 5852989 + ... + 5853154.

It is an arithmetic number, because the mean of its divisors is an integer number (245829024).

Almost surely, 2^971609869 is an apocalyptic number.

It is an amenable number.

971609869 is a deficient number, since it is larger than the sum of its proper divisors (11706227).

971609869 is a wasteful number, since it uses less digits than its factorization.

971609869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11706226.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 971609869 is about 31170.6571794693. The cubic root of 971609869 is about 990.4456276968.

The spelling of 971609869 in words is "nine hundred seventy-one million, six hundred nine thousand, eight hundred sixty-nine".