531689445 has 144 divisors (see below), whose sum is σ = 1162362240. Its totient is φ = 224042112.

The previous prime is 531689443. The next prime is 531689447. The reversal of 531689445 is 544986135.

It is an interprime number because it is at equal distance from previous prime (531689443) and next prime (531689447).

It is not a de Polignac number, because 531689445 - 2¹ = 531689443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531689445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531689443) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14369967 + ... + 14370003.

It is an arithmetic number, because the mean of its divisors is an integer number (8071960).

Almost surely, 2^531689445 is an apocalyptic number.

It is an amenable number.

531689445 is an abundant number, since it is smaller than the sum of its proper divisors (630672795).

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

531689445 is an equidigital number, since it uses as much as digits as its factorization.

531689445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 71 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 531689445 is about 23058.3920731694. The cubic root of 531689445 is about 810.1262034723.

The spelling of 531689445 in words is "five hundred thirty-one million, six hundred eighty-nine thousand, four hundred forty-five".