531661312 has 80 divisors (see below), whose sum is σ = 1307541312. Its totient is φ = 210309120.

The previous prime is 531661289. The next prime is 531661313. The reversal of 531661312 is 213166135.

It is a super-2 number, since 2×531661312² = 565327501355122688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (531661313) 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, 40887 + ... + 52297.

Almost surely, 2^531661312 is an apocalyptic number.

531661312 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531661312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653770656).

531661312 is an abundant number, since it is smaller than the sum of its proper divisors (775880000).

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

531661312 is a wasteful number, since it uses less digits than its factorization.

531661312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11449 (or 11433 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 531661312 is about 23057.7820268993. The cubic root of 531661312 is about 810.1119146284. Note that the first 3 decimals are identical.

The spelling of 531661312 in words is "five hundred thirty-one million, six hundred sixty-one thousand, three hundred twelve".