1161203263 has 16 divisors (see below), whose sum is σ = 1276375680. Its totient is φ = 1047664800.

The previous prime is 1161203233. The next prime is 1161203273. The reversal of 1161203263 is 3623021611.

It is a cyclic number.

It is not a de Polignac number, because 1161203263 - 2²⁵ = 1127648831 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 (1161203233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570948 + ... + 1571686.

It is an arithmetic number, because the mean of its divisors is an integer number (79773480).

Almost surely, 2^1161203263 is an apocalyptic number.

1161203263 is a deficient number, since it is larger than the sum of its proper divisors (115172417).

1161203263 is a wasteful number, since it uses less digits than its factorization.

1161203263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1161203263 is about 34076.4326624722. The cubic root of 1161203263 is about 1051.0807505575.

Adding to 1161203263 its reverse (3623021611), we get a palindrome (4784224874).

The spelling of 1161203263 in words is "one billion, one hundred sixty-one million, two hundred three thousand, two hundred sixty-three".