31120073 has 2 divisors, whose sum is σ = 31120074. Its totient is φ = 31120072.

The previous prime is 31120051. The next prime is 31120079. The reversal of 31120073 is 37002113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30063289 + 1056784 = 5483^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120073 - 2⁶ = 31120009 is a prime.

It is a super-3 number, since 3×31120073³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31120079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560036 + 15560037.

It is an arithmetic number, because the mean of its divisors is an integer number (15560037).

Almost surely, 2^31120073 is an apocalyptic number.

It is an amenable number.

31120073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120073 is an equidigital number, since it uses as much as digits as its factorization.

31120073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 31120073 is about 5578.5368153307. The cubic root of 31120073 is about 314.5431287284.

Adding to 31120073 its reverse (37002113), we get a palindrome (68122186).

The spelling of 31120073 in words is "thirty-one million, one hundred twenty thousand, seventy-three".