4381531 has 18 divisors (see below), whose sum is σ = 5609940. Its totient is φ = 3409560.

The previous prime is 4381513. The next prime is 4381537. The reversal of 4381531 is 1351834.

It is not a de Polignac number, because 4381531 - 2⁵ = 4381499 is a prime.

It is a super-2 number, since 2×4381531² = 38395627807922, which contains 22 as substring.

4381531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4381496 and 4381505.

It is not an unprimeable number, because it can be changed into a prime (4381537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5560 + ... + 6298.

Almost surely, 2^4381531 is an apocalyptic number.

4381531 is a deficient number, since it is larger than the sum of its proper divisors (1228409).

4381531 is a wasteful number, since it uses less digits than its factorization.

4381531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 757 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 4381531 is about 2093.2106917365. The cubic root of 4381531 is about 163.6346591760.

The spelling of 4381531 in words is "four million, three hundred eighty-one thousand, five hundred thirty-one".