971428823 has 4 divisors (see below), whose sum is σ = 972111000. Its totient is φ = 970746648.

The previous prime is 971428817. The next prime is 971428831. The reversal of 971428823 is 328824179.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 971428823 - 2¹⁰ = 971427799 is a prime.

It is a super-3 number, since 3×971428823³ (a number of 28 digits) contains 333 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 (971428723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338948 + ... + 341801.

It is an arithmetic number, because the mean of its divisors is an integer number (243027750).

Almost surely, 2^971428823 is an apocalyptic number.

971428823 is a deficient number, since it is larger than the sum of its proper divisors (682177).

971428823 is a wasteful number, since it uses less digits than its factorization.

971428823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682176.

The product of its digits is 193536, while the sum is 44.

The square root of 971428823 is about 31167.7529347241. The cubic root of 971428823 is about 990.3841052814.

It can be divided in two parts, 97 and 1428823, that multiplied together give a palindrome (138595831).

The spelling of 971428823 in words is "nine hundred seventy-one million, four hundred twenty-eight thousand, eight hundred twenty-three".