1542819862609 has 3 divisors (see below), whose sum is σ = 1542821104713. Its totient is φ = 1542818620506.

The previous prime is 1542819862583. The next prime is 1542819862621. The reversal of 1542819862609 is 9062689182451.

The square root of 1542819862609 is 1242103.

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 is not a de Polignac number, because 1542819862609 - 2²¹ = 1542817765457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542819862669) 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, 621052 + ... + 1863154.

It is an arithmetic number, because the mean of its divisors is an integer number (514273701571).

Almost surely, 2^{1542819862609} is an apocalyptic number.

1542819862609 is the 1242103-rd square number.

1542819862609 is the 621052-nd centered octagonal number.

It is an amenable number.

1542819862609 is a deficient number, since it is larger than the sum of its proper divisors (1242104).

1542819862609 is an frugal number, since it uses more digits than its factorization.

1542819862609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484206 (or 1242103 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 1542819862609 in words is "one trillion, five hundred forty-two billion, eight hundred nineteen million, eight hundred sixty-two thousand, six hundred nine".