1161445511 has 2 divisors, whose sum is σ = 1161445512. Its totient is φ = 1161445510.

The previous prime is 1161445501. The next prime is 1161445531. The reversal of 1161445511 is 1155441611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1161445511 - 2¹⁴ = 1161429127 is a prime.

It is a super-2 number, since 2×1161445511² = 2697911350044102242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161445501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580722755 + 580722756.

It is an arithmetic number, because the mean of its divisors is an integer number (580722756).

Almost surely, 2^1161445511 is an apocalyptic number.

1161445511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161445511 is an equidigital number, since it uses as much as digits as its factorization.

1161445511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 29.

The square root of 1161445511 is about 34079.9869571571. The cubic root of 1161445511 is about 1051.1538369595.

The spelling of 1161445511 in words is "one billion, one hundred sixty-one million, four hundred forty-five thousand, five hundred eleven".