531221425 has 48 divisors (see below), whose sum is σ = 782838784. Its totient is φ = 349920000.

The previous prime is 531221393. The next prime is 531221429. The reversal of 531221425 is 524122135.

It is not a de Polignac number, because 531221425 - 2⁵ = 531221393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 531221425.

It is not an unprimeable number, because it can be changed into a prime (531221429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 981655 + ... + 982195.

Almost surely, 2^531221425 is an apocalyptic number.

It is an amenable number.

531221425 is a deficient number, since it is larger than the sum of its proper divisors (251617359).

531221425 is a wasteful number, since it uses less digits than its factorization.

531221425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 765 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 531221425 is about 23048.2412561132. The cubic root of 531221425 is about 809.8884289755. Note that the first 3 decimals are identical.

The spelling of 531221425 in words is "five hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-five".