82971789 has 4 divisors (see below), whose sum is σ = 110629056. Its totient is φ = 55314524.

The previous prime is 82971769. The next prime is 82971793. The reversal of 82971789 is 98717928.

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 not a de Polignac number, because 82971789 - 2¹³ = 82963597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82971709) 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, 13828629 + ... + 13828634.

It is an arithmetic number, because the mean of its divisors is an integer number (27657264).

Almost surely, 2^82971789 is an apocalyptic number.

It is an amenable number.

82971789 is a deficient number, since it is larger than the sum of its proper divisors (27657267).

82971789 is a wasteful number, since it uses less digits than its factorization.

82971789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27657266.

The product of its digits is 508032, while the sum is 51.

The square root of 82971789 is about 9108.8851677908. The cubic root of 82971789 is about 436.1576405107.

The spelling of 82971789 in words is "eighty-two million, nine hundred seventy-one thousand, seven hundred eighty-nine".