849031221 has 16 divisors (see below), whose sum is σ = 1221251904. Its totient is φ = 522672384.

The previous prime is 849031213. The next prime is 849031229. The reversal of 849031221 is 122130948.

It is an interprime number because it is at equal distance from previous prime (849031213) and next prime (849031229).

It is not a de Polignac number, because 849031221 - 2³ = 849031213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849031229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154351 + ... + 159756.

It is an arithmetic number, because the mean of its divisors is an integer number (76328244).

Almost surely, 2^849031221 is an apocalyptic number.

It is an amenable number.

849031221 is a deficient number, since it is larger than the sum of its proper divisors (372220683).

849031221 is a wasteful number, since it uses less digits than its factorization.

849031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314180.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 849031221 is about 29138.1403147147. The cubic root of 849031221 is about 946.9082205426.

The spelling of 849031221 in words is "eight hundred forty-nine million, thirty-one thousand, two hundred twenty-one".