531355240 has 32 divisors (see below), whose sum is σ = 1287515880. Its totient is φ = 196192512.

The previous prime is 531355219. The next prime is 531355277. The reversal of 531355240 is 42553135.

It can be written as a sum of positive squares in 4 ways, for example, as 463885444 + 67469796 = 21538^2 + 8214^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531355199 and 531355208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510399 + ... + 511438.

Almost surely, 2^531355240 is an apocalyptic number.

It is an amenable number.

531355240 is an abundant number, since it is smaller than the sum of its proper divisors (756160640).

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

531355240 is a wasteful number, since it uses less digits than its factorization.

531355240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021861 (or 1021857 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 531355240 is about 23051.1440063178. The cubic root of 531355240 is about 809.9564270622.

The spelling of 531355240 in words is "five hundred thirty-one million, three hundred fifty-five thousand, two hundred forty".