851851489 has 4 divisors (see below), whose sum is σ = 853343920. Its totient is φ = 850359060.

The previous prime is 851851463. The next prime is 851851531. The reversal of 851851489 is 984158158.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984158158 = 2 ⋅492079079.

It is a cyclic number.

It is not a de Polignac number, because 851851489 - 2⁷ = 851851361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851851409) 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, 745359 + ... + 746500.

It is an arithmetic number, because the mean of its divisors is an integer number (213335980).

Almost surely, 2^851851489 is an apocalyptic number.

It is an amenable number.

851851489 is a deficient number, since it is larger than the sum of its proper divisors (1492431).

851851489 is a wasteful number, since it uses less digits than its factorization.

851851489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492430.

The product of its digits is 460800, while the sum is 49.

The square root of 851851489 is about 29186.4949762728. The cubic root of 851851489 is about 947.9555253545.

The spelling of 851851489 in words is "eight hundred fifty-one million, eight hundred fifty-one thousand, four hundred eighty-nine".