1561352099 has 2 divisors, whose sum is σ = 1561352100. Its totient is φ = 1561352098.

The previous prime is 1561352087. The next prime is 1561352101. The reversal of 1561352099 is 9902531651.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9902531651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1561352099 - 2²⁸ = 1292916643 is a prime.

Together with 1561352101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1561352399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780676049 + 780676050.

It is an arithmetic number, because the mean of its divisors is an integer number (780676050).

Almost surely, 2^1561352099 is an apocalyptic number.

1561352099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561352099 is an equidigital number, since it uses as much as digits as its factorization.

1561352099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 1561352099 is about 39513.9481575810. The cubic root of 1561352099 is about 1160.1129742823.

The spelling of 1561352099 in words is "one billion, five hundred sixty-one million, three hundred fifty-two thousand, ninety-nine".