31040071 has 2 divisors, whose sum is σ = 31040072. Its totient is φ = 31040070.

The previous prime is 31040047. The next prime is 31040081. The reversal of 31040071 is 17004013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31040071 - 2¹³ = 31031879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31040081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15520035 + 15520036.

It is an arithmetic number, because the mean of its divisors is an integer number (15520036).

Almost surely, 2^31040071 is an apocalyptic number.

31040071 is a deficient number, since it is larger than the sum of its proper divisors (1).

31040071 is an equidigital number, since it uses as much as digits as its factorization.

31040071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 31040071 is about 5571.3616827487. The cubic root of 31040071 is about 314.2733599335.

Adding to 31040071 its reverse (17004013), we get a palindrome (48044084).

It can be divided in two parts, 3 and 1040071, that multiplied together give a palindrome (3120213).

The spelling of 31040071 in words is "thirty-one million, forty thousand, seventy-one".