31518049 has 2 divisors, whose sum is σ = 31518050. Its totient is φ = 31518048.

The previous prime is 31518037. The next prime is 31518061. The reversal of 31518049 is 94081513.

It is a balanced prime because it is at equal distance from previous prime (31518037) and next prime (31518061).

It can be written as a sum of positive squares in only one way, i.e., 29084449 + 2433600 = 5393^2 + 1560^2 .

It is an emirp because it is prime and its reverse (94081513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31518049 - 2¹⁷ = 31386977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31518049.

It is not a weakly prime, because it can be changed into another prime (31518089) 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, 15759024 + 15759025.

It is an arithmetic number, because the mean of its divisors is an integer number (15759025).

Almost surely, 2^31518049 is an apocalyptic number.

It is an amenable number.

31518049 is a deficient number, since it is larger than the sum of its proper divisors (1).

31518049 is an equidigital number, since it uses as much as digits as its factorization.

31518049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 31518049 is about 5614.0937826153. The cubic root of 31518049 is about 315.8782879289.

The spelling of 31518049 in words is "thirty-one million, five hundred eighteen thousand, forty-nine".