851242819 has 16 divisors (see below), whose sum is σ = 1035792576. Its totient is φ = 682905600.

The previous prime is 851242813. The next prime is 851242841. The reversal of 851242819 is 918242158.

It is a cyclic number.

It is not a de Polignac number, because 851242819 - 2¹³ = 851234627 is a prime.

It is a super-2 number, since 2×851242819² = 1449228673798133522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (851242813) 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, 1779 + ... + 41299.

It is an arithmetic number, because the mean of its divisors is an integer number (64737036).

Almost surely, 2^851242819 is an apocalyptic number.

851242819 is a deficient number, since it is larger than the sum of its proper divisors (184549757).

851242819 is a wasteful number, since it uses less digits than its factorization.

851242819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39726.

The product of its digits is 46080, while the sum is 40.

The square root of 851242819 is about 29176.0658588508. The cubic root of 851242819 is about 947.7296919485.

The spelling of 851242819 in words is "eight hundred fifty-one million, two hundred forty-two thousand, eight hundred nineteen".