20291911049 has 2 divisors, whose sum is σ = 20291911050. Its totient is φ = 20291911048.

The previous prime is 20291910997. The next prime is 20291911109. The reversal of 20291911049 is 94011919202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18913125625 + 1378785424 = 137525^2 + 37132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20291911049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20291211049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145955524 + 10145955525.

It is an arithmetic number, because the mean of its divisors is an integer number (10145955525).

Almost surely, 2^20291911049 is an apocalyptic number.

It is an amenable number.

20291911049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291911049 is an equidigital number, since it uses as much as digits as its factorization.

20291911049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 20291911049 in words is "twenty billion, two hundred ninety-one million, nine hundred eleven thousand, forty-nine".