1151612161 has 12 divisors (see below), whose sum is σ = 1375838868. Its totient is φ = 960416352.

The previous prime is 1151612129. The next prime is 1151612167. The reversal of 1151612161 is 1612161511.

It can be written as a sum of positive squares in 2 ways, for example, as 1080108225 + 71503936 = 32865^2 + 8456^2 .

It is not a de Polignac number, because 1151612161 - 2⁵ = 1151612129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151612167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315786 + ... + 319411.

It is an arithmetic number, because the mean of its divisors is an integer number (114653239).

Almost surely, 2^1151612161 is an apocalyptic number.

It is an amenable number.

1151612161 is a deficient number, since it is larger than the sum of its proper divisors (224226707).

1151612161 is an equidigital number, since it uses as much as digits as its factorization.

1151612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635248 (or 635241 counting only the distinct ones).

The product of its digits is 360, while the sum is 25.

The square root of 1151612161 is about 33935.4116079354. The cubic root of 1151612161 is about 1048.1789026132.

Adding to 1151612161 its reverse (1612161511), we get a palindrome (2763773672).

The spelling of 1151612161 in words is "one billion, one hundred fifty-one million, six hundred twelve thousand, one hundred sixty-one".