20315017249 has 2 divisors, whose sum is σ = 20315017250. Its totient is φ = 20315017248.

The previous prime is 20315017241. The next prime is 20315017259. The reversal of 20315017249 is 94271051302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16488357649 + 3826659600 = 128407^2 + 61860^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315017249 - 2³ = 20315017241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20315017241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157508624 + 10157508625.

It is an arithmetic number, because the mean of its divisors is an integer number (10157508625).

Almost surely, 2^20315017249 is an apocalyptic number.

It is an amenable number.

20315017249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315017249 is an equidigital number, since it uses as much as digits as its factorization.

20315017249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 20315017249 in words is "twenty billion, three hundred fifteen million, seventeen thousand, two hundred forty-nine".