19093988761 has 3 divisors (see below), whose sum is σ = 19094126943. Its totient is φ = 19093850580.

The previous prime is 19093988747. The next prime is 19093988773. The reversal of 19093988761 is 16788939091.

The square root of 19093988761 is 138181.

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.

It can be written as a sum of positive squares in only one way, i.e., 16830132361 + 2263856400 = 129731^2 + 47580^2 .

It is not a de Polignac number, because 19093988761 - 2¹³ = 19093980569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19093988761.

It is not an unprimeable number, because it can be changed into a prime (19093988741) 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, 69091 + ... + 207271.

It is an arithmetic number, because the mean of its divisors is an integer number (6364708981).

Almost surely, 2^19093988761 is an apocalyptic number.

19093988761 is the 138181-st square number.

19093988761 is the 69091-st centered octagonal number.

It is an amenable number.

19093988761 is a deficient number, since it is larger than the sum of its proper divisors (138182).

19093988761 is an frugal number, since it uses more digits than its factorization.

19093988761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276362 (or 138181 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 19093988761 in words is "nineteen billion, ninety-three million, nine hundred eighty-eight thousand, seven hundred sixty-one".