534123891 has 24 divisors (see below), whose sum is σ = 887360864. Its totient is φ = 303264000.

The previous prime is 534123883. The next prime is 534123899. The reversal of 534123891 is 198321435.

534123891 is a `hidden beast` number, since 534 + 1 + 2 + 38 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (534123883) and next prime (534123899).

It is not a de Polignac number, because 534123891 - 2³ = 534123883 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (534123899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17110 + ... + 36891.

Almost surely, 2^534123891 is an apocalyptic number.

534123891 is a deficient number, since it is larger than the sum of its proper divisors (353236973).

534123891 is a wasteful number, since it uses less digits than its factorization.

534123891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54171 (or 54168 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 534123891 is about 23111.1205050729. The cubic root of 534123891 is about 811.3607625417.

The spelling of 534123891 in words is "five hundred thirty-four million, one hundred twenty-three thousand, eight hundred ninety-one".