31204425 has 48 divisors (see below), whose sum is σ = 60214400. Its totient is φ = 14253120.

The previous prime is 31204423. The next prime is 31204427. The reversal of 31204425 is 52440213.

It is an interprime number because it is at equal distance from previous prime (31204423) and next prime (31204427).

It is not a de Polignac number, because 31204425 - 2¹ = 31204423 is a prime.

It is a super-2 number, since 2×31204425² = 1947432279161250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31204421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25119 + ... + 26331.

Almost surely, 2^31204425 is an apocalyptic number.

31204425 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31204425 is a deficient number, since it is larger than the sum of its proper divisors (29009975).

31204425 is a wasteful number, since it uses less digits than its factorization.

31204425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 31204425 is about 5586.0921045038. The cubic root of 31204425 is about 314.8270655705.

Adding to 31204425 its reverse (52440213), we get a palindrome (83644638).

The spelling of 31204425 in words is "thirty-one million, two hundred four thousand, four hundred twenty-five".