20311801918249 has 2 divisors, whose sum is σ = 20311801918250. Its totient is φ = 20311801918248.

The previous prime is 20311801918193. The next prime is 20311801918279. The reversal of 20311801918249 is 94281910811302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12132459316224 + 8179342602025 = 3483168^2 + 2859955^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311801918249 - 2⁴¹ = 18112778662697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20311801918279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155900959124 + 10155900959125.

It is an arithmetic number, because the mean of its divisors is an integer number (10155900959125).

Almost surely, 2^{20311801918249} is an apocalyptic number.

It is an amenable number.

20311801918249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311801918249 is an equidigital number, since it uses as much as digits as its factorization.

20311801918249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 20311801918249 in words is "twenty trillion, three hundred eleven billion, eight hundred one million, nine hundred eighteen thousand, two hundred forty-nine".