523174021 has 6 divisors (see below), whose sum is σ = 525964166. Its totient is φ = 520398600.

The previous prime is 523174019. The next prime is 523174033. The reversal of 523174021 is 120471325.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 295496100 + 227677921 = 17190^2 + 15089^2 .

It is not a de Polignac number, because 523174021 - 2¹ = 523174019 is a prime.

It is a super-2 number, since 2×523174021² = 547422112498616882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523174081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29311 + ... + 43651.

Almost surely, 2^523174021 is an apocalyptic number.

It is an amenable number.

523174021 is a deficient number, since it is larger than the sum of its proper divisors (2790145).

523174021 is an equidigital number, since it uses as much as digits as its factorization.

523174021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14723 (or 14532 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 523174021 is about 22872.9976391377. The cubic root of 523174021 is about 805.7779709514. Note that the first 3 decimals are identical.

The spelling of 523174021 in words is "five hundred twenty-three million, one hundred seventy-four thousand, twenty-one".