1161945583 has 4 divisors (see below), whose sum is σ = 1166807520. Its totient is φ = 1157083648.

The previous prime is 1161945571. The next prime is 1161945607. The reversal of 1161945583 is 3855491611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3855491611 = 12473 ⋅309107.

It is a cyclic number.

It is not a de Polignac number, because 1161945583 - 2²⁵ = 1128391151 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 (1161945283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2430610 + ... + 2431087.

It is an arithmetic number, because the mean of its divisors is an integer number (291701880).

Almost surely, 2^1161945583 is an apocalyptic number.

1161945583 is a deficient number, since it is larger than the sum of its proper divisors (4861937).

1161945583 is an equidigital number, since it uses as much as digits as its factorization.

1161945583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861936.

The product of its digits is 129600, while the sum is 43.

The square root of 1161945583 is about 34087.3229074974. The cubic root of 1161945583 is about 1051.3046769180.

The spelling of 1161945583 in words is "one billion, one hundred sixty-one million, nine hundred forty-five thousand, five hundred eighty-three".