31231073 has 2 divisors, whose sum is σ = 31231074. Its totient is φ = 31231072.

The previous prime is 31231069. The next prime is 31231097. The reversal of 31231073 is 37013213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31225744 + 5329 = 5588^2 + 73^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231073 - 2² = 31231069 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615536 + 15615537.

It is an arithmetic number, because the mean of its divisors is an integer number (15615537).

Almost surely, 2^31231073 is an apocalyptic number.

It is an amenable number.

31231073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231073 is an equidigital number, since it uses as much as digits as its factorization.

31231073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 31231073 is about 5588.4768049979. The cubic root of 31231073 is about 314.9166588960.

Adding to 31231073 its reverse (37013213), we get a palindrome (68244286).

The spelling of 31231073 in words is "thirty-one million, two hundred thirty-one thousand, seventy-three".