31388041 has 2 divisors, whose sum is σ = 31388042. Its totient is φ = 31388040.

The previous prime is 31388039. The next prime is 31388051. The reversal of 31388041 is 14088313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 4968441 = 5140^2 + 2229^2 .

It is an emirp because it is prime and its reverse (14088313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31388041 - 2¹ = 31388039 is a prime.

Together with 31388039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31388051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15694020 + 15694021.

It is an arithmetic number, because the mean of its divisors is an integer number (15694021).

Almost surely, 2^31388041 is an apocalyptic number.

It is an amenable number.

31388041 is a deficient number, since it is larger than the sum of its proper divisors (1).

31388041 is an equidigital number, since it uses as much as digits as its factorization.

31388041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 31388041 is about 5602.5031012932. The cubic root of 31388041 is about 315.4433699426.

The spelling of 31388041 in words is "thirty-one million, three hundred eighty-eight thousand, forty-one".