1151144561 has 4 divisors (see below), whose sum is σ = 1315593792. Its totient is φ = 986695332.

The previous prime is 1151144557. The next prime is 1151144563. The reversal of 1151144561 is 1654411511.

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 1151144561 - 2² = 1151144557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151144563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82224605 + ... + 82224618.

It is an arithmetic number, because the mean of its divisors is an integer number (328898448).

Almost surely, 2^1151144561 is an apocalyptic number.

It is an amenable number.

1151144561 is a deficient number, since it is larger than the sum of its proper divisors (164449231).

1151144561 is an equidigital number, since it uses as much as digits as its factorization.

1151144561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164449230.

The product of its digits is 2400, while the sum is 29.

The square root of 1151144561 is about 33928.5213500382. The cubic root of 1151144561 is about 1048.0370160696.

The spelling of 1151144561 in words is "one billion, one hundred fifty-one million, one hundred forty-four thousand, five hundred sixty-one".