1428712181 has 16 divisors (see below), whose sum is σ = 1634125248. Its totient is φ = 1237420800.

The previous prime is 1428712139. The next prime is 1428712189. The reversal of 1428712181 is 1812178241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428712181 is a prime.

It is a super-2 number, since 2×1428712181² = 4082436992275553522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428712189) 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, 63386 + ... + 82916.

It is an arithmetic number, because the mean of its divisors is an integer number (102132828).

Almost surely, 2^1428712181 is an apocalyptic number.

It is an amenable number.

1428712181 is a deficient number, since it is larger than the sum of its proper divisors (205413067).

1428712181 is a wasteful number, since it uses less digits than its factorization.

1428712181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19892.

The product of its digits is 7168, while the sum is 35.

The square root of 1428712181 is about 37798.3092346734. The cubic root of 1428712181 is about 1126.2848677246.

The spelling of 1428712181 in words is "one billion, four hundred twenty-eight million, seven hundred twelve thousand, one hundred eighty-one".