13737781217 has 2 divisors, whose sum is σ = 13737781218. Its totient is φ = 13737781216.

The previous prime is 13737781193. The next prime is 13737781241. The reversal of 13737781217 is 71218773731.

It is a balanced prime because it is at equal distance from previous prime (13737781193) and next prime (13737781241).

It can be written as a sum of positive squares in only one way, i.e., 12115625041 + 1622156176 = 110071^2 + 40276^2 .

It is a cyclic number.

It is not a de Polignac number, because 13737781217 - 2¹⁸ = 13737519073 is a prime.

It is not a weakly prime, because it can be changed into another prime (13737781117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6868890608 + 6868890609.

It is an arithmetic number, because the mean of its divisors is an integer number (6868890609).

Almost surely, 2^13737781217 is an apocalyptic number.

It is an amenable number.

13737781217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13737781217 is an equidigital number, since it uses as much as digits as its factorization.

13737781217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345744, while the sum is 47.

The spelling of 13737781217 in words is "thirteen billion, seven hundred thirty-seven million, seven hundred eighty-one thousand, two hundred seventeen".