13891804249 has 2 divisors, whose sum is σ = 13891804250. Its totient is φ = 13891804248.

The previous prime is 13891804183. The next prime is 13891804261. The reversal of 13891804249 is 94240819831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8731968025 + 5159836224 = 93445^2 + 71832^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891804249 - 2¹³ = 13891796057 is a prime.

It is not a weakly prime, because it can be changed into another prime (13891804649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945902124 + 6945902125.

It is an arithmetic number, because the mean of its divisors is an integer number (6945902125).

Almost surely, 2^13891804249 is an apocalyptic number.

It is an amenable number.

13891804249 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891804249 is an equidigital number, since it uses as much as digits as its factorization.

13891804249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 13891804249 in words is "thirteen billion, eight hundred ninety-one million, eight hundred four thousand, two hundred forty-nine".