531447990 has 16 divisors (see below), whose sum is σ = 1275475248. Its totient is φ = 141719456.

The previous prime is 531447979. The next prime is 531447991. The reversal of 531447990 is 99744135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531447991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8857437 + ... + 8857496.

It is an arithmetic number, because the mean of its divisors is an integer number (79717203).

Almost surely, 2^531447990 is an apocalyptic number.

531447990 is an abundant number, since it is smaller than the sum of its proper divisors (744027258).

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

531447990 is a wasteful number, since it uses less digits than its factorization.

531447990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17714943.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 531447990 is about 23053.1557492678. The cubic root of 531447990 is about 810.0035512723.

The spelling of 531447990 in words is "five hundred thirty-one million, four hundred forty-seven thousand, nine hundred ninety".