1161565541 has 2 divisors, whose sum is σ = 1161565542. Its totient is φ = 1161565540.

The previous prime is 1161565529. The next prime is 1161565553. The reversal of 1161565541 is 1455651611.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1161565529) and next prime (1161565553).

It can be written as a sum of positive squares in only one way, i.e., 1159674916 + 1890625 = 34054^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161565541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161565441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580782770 + 580782771.

It is an arithmetic number, because the mean of its divisors is an integer number (580782771).

Almost surely, 2^1161565541 is an apocalyptic number.

It is an amenable number.

1161565541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161565541 is an equidigital number, since it uses as much as digits as its factorization.

1161565541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 1161565541 is about 34081.7479158567. The cubic root of 1161565541 is about 1051.1900463348.

The spelling of 1161565541 in words is "one billion, one hundred sixty-one million, five hundred sixty-five thousand, five hundred forty-one".