163031425 has 6 divisors (see below), whose sum is σ = 202158998. Its totient is φ = 130425120.

The previous prime is 163031399. The next prime is 163031437. The reversal of 163031425 is 524130361.

163031425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 29582721 + 133448704 = 5439^2 + 11552^2 .

It is not a de Polignac number, because 163031425 - 2⁹ = 163030913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6521257 = 163031425 / (1 + 6 + 3 + 0 + 3 + 1 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163031425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3260604 + ... + 3260653.

Almost surely, 2^163031425 is an apocalyptic number.

It is an amenable number.

163031425 is a deficient number, since it is larger than the sum of its proper divisors (39127573).

163031425 is an equidigital number, since it uses as much as digits as its factorization.

163031425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6521267 (or 6521262 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 163031425 is about 12768.3759734745. The cubic root of 163031425 is about 546.2906593323.

Adding to 163031425 its reverse (524130361), we get a palindrome (687161786).

The spelling of 163031425 in words is "one hundred sixty-three million, thirty-one thousand, four hundred twenty-five".