1161561435 has 16 divisors (see below), whose sum is σ = 1859099424. Its totient is φ = 619299072.

The previous prime is 1161561361. The next prime is 1161561439. The reversal of 1161561435 is 5341651611.

It is not a de Polignac number, because 1161561435 - 2¹⁴ = 1161545051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1161561396 and 1161561405.

It is not an unprimeable number, because it can be changed into a prime (1161561439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43479 + ... + 64911.

It is an arithmetic number, because the mean of its divisors is an integer number (116193714).

Almost surely, 2^1161561435 is an apocalyptic number.

1161561435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1161561435 is a deficient number, since it is larger than the sum of its proper divisors (697537989).

1161561435 is a wasteful number, since it uses less digits than its factorization.

1161561435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25054.

The product of its digits is 10800, while the sum is 33.

The square root of 1161561435 is about 34081.6876782826. The cubic root of 1161561435 is about 1051.1888077215.

The spelling of 1161561435 in words is "one billion, one hundred sixty-one million, five hundred sixty-one thousand, four hundred thirty-five".