1161251205 has 64 divisors (see below), whose sum is σ = 1976659200. Its totient is φ = 581253120.

The previous prime is 1161251191. The next prime is 1161251207. The reversal of 1161251205 is 5021521611.

It is not a de Polignac number, because 1161251205 - 2⁹ = 1161250693 is a prime.

It is a super-2 number, since 2×1161251205² = 2697008722227904050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161251207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2839041 + ... + 2839449.

It is an arithmetic number, because the mean of its divisors is an integer number (30885300).

Almost surely, 2^1161251205 is an apocalyptic number.

1161251205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161251205 is a deficient number, since it is larger than the sum of its proper divisors (815407995).

1161251205 is a wasteful number, since it uses less digits than its factorization.

1161251205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1161251205 is about 34077.1361032584. The cubic root of 1161251205 is about 1051.0952155014.

Adding to 1161251205 its reverse (5021521611), we get a palindrome (6182772816).

The spelling of 1161251205 in words is "one billion, one hundred sixty-one million, two hundred fifty-one thousand, two hundred five".