19542070909 has 2 divisors, whose sum is σ = 19542070910. Its totient is φ = 19542070908.

The previous prime is 19542070901. The next prime is 19542070913. The reversal of 19542070909 is 90907024591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10327030884 + 9215040025 = 101622^2 + 95995^2 .

It is a cyclic number.

It is not a de Polignac number, because 19542070909 - 2³ = 19542070901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19542070901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9771035454 + 9771035455.

It is an arithmetic number, because the mean of its divisors is an integer number (9771035455).

Almost surely, 2^19542070909 is an apocalyptic number.

It is an amenable number.

19542070909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19542070909 is an equidigital number, since it uses as much as digits as its factorization.

19542070909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 19542070909 in words is "nineteen billion, five hundred forty-two million, seventy thousand, nine hundred nine".