869971993 has 4 divisors (see below), whose sum is σ = 949060368. Its totient is φ = 790883620.

The previous prime is 869971979. The next prime is 869972023. The reversal of 869971993 is 399179968.

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 a de Polignac number, because none of the positive numbers 2^k-869971993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869971793) 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, 39544171 + ... + 39544192.

It is an arithmetic number, because the mean of its divisors is an integer number (237265092).

Almost surely, 2^869971993 is an apocalyptic number.

It is an amenable number.

869971993 is a deficient number, since it is larger than the sum of its proper divisors (79088375).

869971993 is a wasteful number, since it uses less digits than its factorization.

869971993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79088374.

The product of its digits is 6613488, while the sum is 61.

The square root of 869971993 is about 29495.2876405707. The cubic root of 869971993 is about 954.6300269142.

The spelling of 869971993 in words is "eight hundred sixty-nine million, nine hundred seventy-one thousand, nine hundred ninety-three".