1151801161 has 4 divisors (see below), whose sum is σ = 1316344192. Its totient is φ = 987258132.

The previous prime is 1151801143. The next prime is 1151801173. The reversal of 1151801161 is 1611081511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1151801161 - 2⁹ = 1151800649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151801111) 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, 82271505 + ... + 82271518.

It is an arithmetic number, because the mean of its divisors is an integer number (329086048).

Almost surely, 2^1151801161 is an apocalyptic number.

It is an amenable number.

1151801161 is a deficient number, since it is larger than the sum of its proper divisors (164543031).

1151801161 is an equidigital number, since it uses as much as digits as its factorization.

1151801161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164543030.

The product of its (nonzero) digits is 240, while the sum is 25.

The square root of 1151801161 is about 33938.1961954374. The cubic root of 1151801161 is about 1048.2362410652.

Adding to 1151801161 its reverse (1611081511), we get a palindrome (2762882672).

The spelling of 1151801161 in words is "one billion, one hundred fifty-one million, eight hundred one thousand, one hundred sixty-one".