851239093 has 4 divisors (see below), whose sum is σ = 863228448. Its totient is φ = 839249740.

The previous prime is 851239069. The next prime is 851239099. The reversal of 851239093 is 390932158.

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 851239093 - 2¹³ = 851230901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851239099) 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, 5994571 + ... + 5994712.

It is an arithmetic number, because the mean of its divisors is an integer number (215807112).

Almost surely, 2^851239093 is an apocalyptic number.

It is an amenable number.

851239093 is a deficient number, since it is larger than the sum of its proper divisors (11989355).

851239093 is a wasteful number, since it uses less digits than its factorization.

851239093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11989354.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 851239093 is about 29176.0020050726. The cubic root of 851239093 is about 947.7283091680.

The spelling of 851239093 in words is "eight hundred fifty-one million, two hundred thirty-nine thousand, ninety-three".