31423033 has 2 divisors, whose sum is σ = 31423034. Its totient is φ = 31423032.

The previous prime is 31422997. The next prime is 31423039. The reversal of 31423033 is 33032413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 10738729 = 4548^2 + 3277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31423033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31423033.

It is not a weakly prime, because it can be changed into another prime (31423039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711516 + 15711517.

It is an arithmetic number, because the mean of its divisors is an integer number (15711517).

Almost surely, 2^31423033 is an apocalyptic number.

It is an amenable number.

31423033 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423033 is an equidigital number, since it uses as much as digits as its factorization.

31423033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 31423033 is about 5605.6251212510. The cubic root of 31423033 is about 315.5605472156.

Adding to 31423033 its reverse (33032413), we get a palindrome (64455446).

The spelling of 31423033 in words is "thirty-one million, four hundred twenty-three thousand, thirty-three".