845377221 has 16 divisors (see below), whose sum is σ = 1246684544. Its totient is φ = 506170944.

The previous prime is 845377219. The next prime is 845377261. The reversal of 845377221 is 122773548.

It is not a de Polignac number, because 845377221 - 2¹ = 845377219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 845377221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845377201) 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, 291481 + ... + 294366.

It is an arithmetic number, because the mean of its divisors is an integer number (77917784).

Almost surely, 2^845377221 is an apocalyptic number.

It is an amenable number.

845377221 is a deficient number, since it is larger than the sum of its proper divisors (401307323).

845377221 is a wasteful number, since it uses less digits than its factorization.

845377221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585900.

The product of its digits is 94080, while the sum is 39.

The square root of 845377221 is about 29075.3713819789. The cubic root of 845377221 is about 945.5478551081.

The spelling of 845377221 in words is "eight hundred forty-five million, three hundred seventy-seven thousand, two hundred twenty-one".