19311827089 has 3 divisors (see below), whose sum is σ = 19311966057. Its totient is φ = 19311688122.

The previous prime is 19311827071. The next prime is 19311827113. The reversal of 19311827089 is 98072811391.

The square root of 19311827089 is 138967.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98072811391 = 419 ⋅234063989.

It is not a de Polignac number, because 19311827089 - 2⁵ = 19311827057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19311827389) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 69484 + ... + 208450.

It is an arithmetic number, because the mean of its divisors is an integer number (6437322019).

Almost surely, 2^19311827089 is an apocalyptic number.

19311827089 is the 138967-th square number.

19311827089 is the 69484-th centered octagonal number.

It is an amenable number.

19311827089 is a deficient number, since it is larger than the sum of its proper divisors (138968).

19311827089 is an frugal number, since it uses more digits than its factorization.

19311827089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277934 (or 138967 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 49.

Multiplying 19311827089 by its sum of digits (49), we get a square (946279527361 = 972769²).

It can be divided in two parts, 19311 and 827089, that added together give a square (846400 = 920²).

The spelling of 19311827089 in words is "nineteen billion, three hundred eleven million, eight hundred twenty-seven thousand, eighty-nine".