785471221 has 4 divisors (see below), whose sum is σ = 785711200. Its totient is φ = 785231244.

The previous prime is 785471147. The next prime is 785471263. The reversal of 785471221 is 122174587.

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 785471221 - 2²³ = 777082613 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 (785171221) 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, 115011 + ... + 121648.

It is an arithmetic number, because the mean of its divisors is an integer number (196427800).

Almost surely, 2^785471221 is an apocalyptic number.

It is an amenable number.

785471221 is a deficient number, since it is larger than the sum of its proper divisors (239979).

785471221 is a wasteful number, since it uses less digits than its factorization.

785471221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239978.

The product of its digits is 31360, while the sum is 37.

The square root of 785471221 is about 28026.2594899855. The cubic root of 785471221 is about 922.6636812205.

The spelling of 785471221 in words is "seven hundred eighty-five million, four hundred seventy-one thousand, two hundred twenty-one".