1161145203 has 16 divisors (see below), whose sum is σ = 1643421600. Its totient is φ = 726713856.

The previous prime is 1161145189. The next prime is 1161145231. The reversal of 1161145203 is 3025411611.

It is a happy number.

It is not a de Polignac number, because 1161145203 - 2¹³ = 1161137011 is a prime.

It is a super-2 number, since 2×1161145203² = 2696516364899822418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161145243) 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, 8428 + ... + 48921.

It is an arithmetic number, because the mean of its divisors is an integer number (102713850).

Almost surely, 2^1161145203 is an apocalyptic number.

1161145203 is a deficient number, since it is larger than the sum of its proper divisors (482276397).

1161145203 is a wasteful number, since it uses less digits than its factorization.

1161145203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57766.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1161145203 is about 34075.5807434004. The cubic root of 1161145203 is about 1051.0632323023.

Adding to 1161145203 its reverse (3025411611), we get a palindrome (4186556814).

The spelling of 1161145203 in words is "one billion, one hundred sixty-one million, one hundred forty-five thousand, two hundred three".