31213043 has 2 divisors, whose sum is σ = 31213044. Its totient is φ = 31213042.

The previous prime is 31213027. The next prime is 31213051. The reversal of 31213043 is 34031213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31213043 - 2⁴ = 31213027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31213243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606521 + 15606522.

It is an arithmetic number, because the mean of its divisors is an integer number (15606522).

Almost surely, 2^31213043 is an apocalyptic number.

31213043 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213043 is an equidigital number, since it uses as much as digits as its factorization.

31213043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31213043 is about 5586.8634313002. The cubic root of 31213043 is about 314.8560457543.

Adding to 31213043 its reverse (34031213), we get a palindrome (65244256).

The spelling of 31213043 in words is "thirty-one million, two hundred thirteen thousand, forty-three".