31345073 has 2 divisors, whose sum is σ = 31345074. Its totient is φ = 31345072.

The previous prime is 31345057. The next prime is 31345081. The reversal of 31345073 is 37054313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25080064 + 6265009 = 5008^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 31345073 - 2⁴ = 31345057 is a prime.

It is not a weakly prime, because it can be changed into another prime (31345273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672536 + 15672537.

It is an arithmetic number, because the mean of its divisors is an integer number (15672537).

Almost surely, 2^31345073 is an apocalyptic number.

It is an amenable number.

31345073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345073 is an equidigital number, since it uses as much as digits as its factorization.

31345073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 31345073 is about 5598.6670735096. The cubic root of 31345073 is about 315.2993643511.

Adding to 31345073 its reverse (37054313), we get a palindrome (68399386).

The spelling of 31345073 in words is "thirty-one million, three hundred forty-five thousand, seventy-three".