531251240 has 128 divisors (see below), whose sum is σ = 1375799040. Its totient is φ = 183085056.

The previous prime is 531251239. The next prime is 531251269. The reversal of 531251240 is 42152135.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 513764 + ... + 514796.

It is an arithmetic number, because the mean of its divisors is an integer number (10748430).

Almost surely, 2^531251240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531251240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687899520).

531251240 is an abundant number, since it is smaller than the sum of its proper divisors (844547800).

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

531251240 is a wasteful number, since it uses less digits than its factorization.

531251240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 531251240 is about 23048.8880425933. Note that the first 3 decimals coincide. The cubic root of 531251240 is about 809.9035804551.

The spelling of 531251240 in words is "five hundred thirty-one million, two hundred fifty-one thousand, two hundred forty".