971745839 has 4 divisors (see below), whose sum is σ = 975916656. Its totient is φ = 967575024.

The previous prime is 971745829. The next prime is 971745869. The reversal of 971745839 is 938547179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938547179 = 467 ⋅2009737.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971745839 is a prime.

It is a super-2 number, since 2×971745839² = 1888579951227627842, 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 (971745829) 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, 2085059 + ... + 2085524.

It is an arithmetic number, because the mean of its divisors is an integer number (243979164).

Almost surely, 2^971745839 is an apocalyptic number.

971745839 is a deficient number, since it is larger than the sum of its proper divisors (4170817).

971745839 is a wasteful number, since it uses less digits than its factorization.

971745839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170816.

The product of its digits is 1905120, while the sum is 53.

The square root of 971745839 is about 31172.8381608092. The cubic root of 971745839 is about 990.4918275193.

The spelling of 971745839 in words is "nine hundred seventy-one million, seven hundred forty-five thousand, eight hundred thirty-nine".