1154142561 has 32 divisors (see below), whose sum is σ = 1812666240. Its totient is φ = 643968000.

The previous prime is 1154142557. The next prime is 1154142637. The reversal of 1154142561 is 1652414511.

It is not a de Polignac number, because 1154142561 - 2² = 1154142557 is a prime.

It is a super-2 number, since 2×1154142561² = 2664090102223277442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1154142161) 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 31 ways as a sum of consecutive naturals, for example, 168675 + ... + 175383.

It is an arithmetic number, because the mean of its divisors is an integer number (56645820).

Almost surely, 2^1154142561 is an apocalyptic number.

1154142561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1154142561 is a deficient number, since it is larger than the sum of its proper divisors (658523679).

1154142561 is a wasteful number, since it uses less digits than its factorization.

1154142561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137.

The product of its digits is 4800, while the sum is 30.

The square root of 1154142561 is about 33972.6737393453. The cubic root of 1154142561 is about 1048.9460508308.

The spelling of 1154142561 in words is "one billion, one hundred fifty-four million, one hundred forty-two thousand, five hundred sixty-one".