13898257891 has 4 divisors (see below), whose sum is σ = 15883723312. Its totient is φ = 11912792472.

The previous prime is 13898257847. The next prime is 13898257903. The reversal of 13898257891 is 19875289831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13898257891 - 2⁹ = 13898257379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13898257831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992732700 + ... + 992732713.

It is an arithmetic number, because the mean of its divisors is an integer number (3970930828).

Almost surely, 2^13898257891 is an apocalyptic number.

13898257891 is a deficient number, since it is larger than the sum of its proper divisors (1985465421).

13898257891 is an equidigital number, since it uses as much as digits as its factorization.

13898257891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985465420.

The product of its digits is 8709120, while the sum is 61.

The spelling of 13898257891 in words is "thirteen billion, eight hundred ninety-eight million, two hundred fifty-seven thousand, eight hundred ninety-one".