1165553953 has 4 divisors (see below), whose sum is σ = 1167520068. Its totient is φ = 1163587840.

The previous prime is 1165553947. The next prime is 1165553971. The reversal of 1165553953 is 3593555611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 746819584 + 418734369 = 27328^2 + 20463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165553953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165553933) 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, 982168 + ... + 983353.

It is an arithmetic number, because the mean of its divisors is an integer number (291880017).

Almost surely, 2^1165553953 is an apocalyptic number.

It is an amenable number.

1165553953 is a deficient number, since it is larger than the sum of its proper divisors (1966115).

1165553953 is an equidigital number, since it uses as much as digits as its factorization.

1165553953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966114.

The product of its digits is 303750, while the sum is 43.

The square root of 1165553953 is about 34140.2102073200. The cubic root of 1165553953 is about 1052.3918122162.

The spelling of 1165553953 in words is "one billion, one hundred sixty-five million, five hundred fifty-three thousand, nine hundred fifty-three".