1561188883 has 2 divisors, whose sum is σ = 1561188884. Its totient is φ = 1561188882.

The previous prime is 1561188859. The next prime is 1561188901. The reversal of 1561188883 is 3888811651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561188883 - 2⁵ = 1561188851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561188823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780594441 + 780594442.

It is an arithmetic number, because the mean of its divisors is an integer number (780594442).

Almost surely, 2^1561188883 is an apocalyptic number.

1561188883 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561188883 is an equidigital number, since it uses as much as digits as its factorization.

1561188883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 49.

The square root of 1561188883 is about 39511.8828075808. The cubic root of 1561188883 is about 1160.0725487226.

The spelling of 1561188883 in words is "one billion, five hundred sixty-one million, one hundred eighty-eight thousand, eight hundred eighty-three".