31234481 has 2 divisors, whose sum is σ = 31234482. Its totient is φ = 31234480.

The previous prime is 31234451. The next prime is 31234513. The reversal of 31234481 is 18443213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 13256881 = 4240^2 + 3641^2 .

It is an emirp because it is prime and its reverse (18443213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31234481 - 2⁶ = 31234417 is a prime.

It is a super-2 number, since 2×31234481² = 1951185606678722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31234481.

It is not a weakly prime, because it can be changed into another prime (31234451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15617240 + 15617241.

It is an arithmetic number, because the mean of its divisors is an integer number (15617241).

Almost surely, 2^31234481 is an apocalyptic number.

It is an amenable number.

31234481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31234481 is an equidigital number, since it uses as much as digits as its factorization.

31234481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 31234481 is about 5588.7817098183. The cubic root of 31234481 is about 314.9281132675.

Adding to 31234481 its reverse (18443213), we get a palindrome (49677694).

The spelling of 31234481 in words is "thirty-one million, two hundred thirty-four thousand, four hundred eighty-one".