971239669 has 4 divisors (see below), whose sum is σ = 984544396. Its totient is φ = 957934944.

The previous prime is 971239637. The next prime is 971239673. The reversal of 971239669 is 966932179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966932179 = 59 ⋅16388681.

It can be written as a sum of positive squares in 2 ways, for example, as 241429444 + 729810225 = 15538^2 + 27015^2 .

It is a cyclic number.

It is not a de Polignac number, because 971239669 - 2⁵ = 971239637 is a prime.

It is a super-2 number, since 2×971239669² = 1886612989278459122, 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 (971209669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6652254 + ... + 6652399.

It is an arithmetic number, because the mean of its divisors is an integer number (246136099).

Almost surely, 2^971239669 is an apocalyptic number.

It is an amenable number.

971239669 is a deficient number, since it is larger than the sum of its proper divisors (13304727).

971239669 is a wasteful number, since it uses less digits than its factorization.

971239669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304726.

The product of its digits is 1102248, while the sum is 52.

The square root of 971239669 is about 31164.7183366062. The cubic root of 971239669 is about 990.3198194682.

The spelling of 971239669 in words is "nine hundred seventy-one million, two hundred thirty-nine thousand, six hundred sixty-nine".