1561036843 has 2 divisors, whose sum is σ = 1561036844. Its totient is φ = 1561036842.

The previous prime is 1561036823. The next prime is 1561036847. The reversal of 1561036843 is 3486301651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561036843 - 2¹⁷ = 1560905771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561036847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780518421 + 780518422.

It is an arithmetic number, because the mean of its divisors is an integer number (780518422).

Almost surely, 2^1561036843 is an apocalyptic number.

1561036843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561036843 is an equidigital number, since it uses as much as digits as its factorization.

1561036843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1561036843 is about 39509.9587825652. The cubic root of 1561036843 is about 1160.0348887148.

The spelling of 1561036843 in words is "one billion, five hundred sixty-one million, thirty-six thousand, eight hundred forty-three".