31381073 has 2 divisors, whose sum is σ = 31381074. Its totient is φ = 31381072.

The previous prime is 31381061. The next prime is 31381079. The reversal of 31381073 is 37018313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 14348944 = 4127^2 + 3788^2 .

It is a cyclic number.

It is not a de Polignac number, because 31381073 - 2²² = 27186769 is a prime.

It is not a weakly prime, because it can be changed into another prime (31381079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15690536 + 15690537.

It is an arithmetic number, because the mean of its divisors is an integer number (15690537).

Almost surely, 2^31381073 is an apocalyptic number.

It is an amenable number.

31381073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31381073 is an equidigital number, since it uses as much as digits as its factorization.

31381073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 31381073 is about 5601.8812018821. The cubic root of 31381073 is about 315.4200258918.

Adding to 31381073 its reverse (37018313), we get a palindrome (68399386).

The spelling of 31381073 in words is "thirty-one million, three hundred eighty-one thousand, seventy-three".