521142444 has 48 divisors (see below), whose sum is σ = 1352458240. Its totient is φ = 173540880.

The previous prime is 521142397. The next prime is 521142451. The reversal of 521142444 is 444241125.

521142444 is a `hidden beast` number, since 5 + 211 + 4 + 2 + 444 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151989 + ... + 155379.

Almost surely, 2^521142444 is an apocalyptic number.

521142444 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

521142444 is an abundant number, since it is smaller than the sum of its proper divisors (831315796).

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

521142444 is a wasteful number, since it uses less digits than its factorization.

521142444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827 (or 4819 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 521142444 is about 22828.5445002523. The cubic root of 521142444 is about 804.7336253290.

Adding to 521142444 its reverse (444241125), we get a palindrome (965383569).

The spelling of 521142444 in words is "five hundred twenty-one million, one hundred forty-two thousand, four hundred forty-four".