849519021 has 16 divisors (see below), whose sum is σ = 1221083136. Its totient is φ = 522240576.

The previous prime is 849518987. The next prime is 849519043. The reversal of 849519021 is 120915948.

It is not a de Polignac number, because 849519021 - 2¹¹ = 849516973 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849519061) 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, 28756 + ... + 50258.

It is an arithmetic number, because the mean of its divisors is an integer number (76317696).

Almost surely, 2^849519021 is an apocalyptic number.

It is an amenable number.

849519021 is a deficient number, since it is larger than the sum of its proper divisors (371564115).

849519021 is a wasteful number, since it uses less digits than its factorization.

849519021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22532.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 849519021 is about 29146.5095851973. The cubic root of 849519021 is about 947.0895304822.

The spelling of 849519021 in words is "eight hundred forty-nine million, five hundred nineteen thousand, twenty-one".