19397853451 has 4 divisors (see below), whose sum is σ = 20538903672. Its totient is φ = 18256803232.

The previous prime is 19397853439. The next prime is 19397853491. The reversal of 19397853451 is 15435879391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15435879391 = 35983 ⋅428977.

It is a cyclic number.

It is not a de Polignac number, because 19397853451 - 2²¹ = 19395756299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19397853392 and 19397853401.

It is not an unprimeable number, because it can be changed into a prime (19397853491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570525085 + ... + 570525118.

It is an arithmetic number, because the mean of its divisors is an integer number (5134725918).

Almost surely, 2^19397853451 is an apocalyptic number.

19397853451 is a deficient number, since it is larger than the sum of its proper divisors (1141050221).

19397853451 is a wasteful number, since it uses less digits than its factorization.

19397853451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141050220.

The product of its digits is 4082400, while the sum is 55.

It can be divided in two parts, 1939785 and 3451, that added together give a square (1943236 = 1394²).

The spelling of 19397853451 in words is "nineteen billion, three hundred ninety-seven million, eight hundred fifty-three thousand, four hundred fifty-one".