971868257 has 6 divisors (see below), whose sum is σ = 1029173094. Its totient is φ = 914578560.

The previous prime is 971868251. The next prime is 971868269. The reversal of 971868257 is 752868179.

971868257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 66520336 + 905347921 = 8156^2 + 30089^2 .

It is a de Polignac number, because none of the positive numbers 2^k-971868257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 971868199 and 971868208.

It is not an unprimeable number, because it can be changed into a prime (971868251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124757 + ... + 132317.

It is an arithmetic number, because the mean of its divisors is an integer number (171528849).

Almost surely, 2^971868257 is an apocalyptic number.

It is an amenable number.

971868257 is a deficient number, since it is larger than the sum of its proper divisors (57304837).

971868257 is an frugal number, since it uses more digits than its factorization.

971868257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15139 (or 7578 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 53.

The square root of 971868257 is about 31174.8016352951. The cubic root of 971868257 is about 990.5334189630.

The spelling of 971868257 in words is "nine hundred seventy-one million, eight hundred sixty-eight thousand, two hundred fifty-seven".