2151898434 has 32 divisors (see below), whose sum is σ = 5465139840. Its totient is φ = 614828016.

The previous prime is 2151898361. The next prime is 2151898451. The reversal of 2151898434 is 4348981512.

2151898434 is a `hidden beast` number, since 2 + 1 + 518 + 98 + 43 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2151898434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2846049 + ... + 2846804.

It is an arithmetic number, because the mean of its divisors is an integer number (170785620).

Almost surely, 2^2151898434 is an apocalyptic number.

2151898434 is an abundant number, since it is smaller than the sum of its proper divisors (3313241406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151898434 is a wasteful number, since it uses less digits than its factorization.

2151898434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692871 (or 5692865 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 2151898434 is about 46388.5593007586. The cubic root of 2151898434 is about 1291.0426508241.

The spelling of 2151898434 in words is "two billion, one hundred fifty-one million, eight hundred ninety-eight thousand, four hundred thirty-four".