1561114911 has 4 divisors (see below), whose sum is σ = 2081486552. Its totient is φ = 1040743272.

The previous prime is 1561114901. The next prime is 1561114927. The reversal of 1561114911 is 1194111651.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1561114911 - 2⁶ = 1561114847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561114901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260185816 + ... + 260185821.

It is an arithmetic number, because the mean of its divisors is an integer number (520371638).

Almost surely, 2^1561114911 is an apocalyptic number.

1561114911 is a deficient number, since it is larger than the sum of its proper divisors (520371641).

1561114911 is an equidigital number, since it uses as much as digits as its factorization.

1561114911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520371640.

The product of its digits is 1080, while the sum is 30.

The square root of 1561114911 is about 39510.9467236613. The cubic root of 1561114911 is about 1160.0542263097.

The spelling of 1561114911 in words is "one billion, five hundred sixty-one million, one hundred fourteen thousand, nine hundred eleven".