1154550721 has 4 divisors (see below), whose sum is σ = 1173477844. Its totient is φ = 1135623600.

The previous prime is 1154550707. The next prime is 1154550739. The reversal of 1154550721 is 1270554511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 1139805121 = 3840^2 + 33761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154550721 - 2⁵ = 1154550689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1154550521) 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, 9463470 + ... + 9463591.

It is an arithmetic number, because the mean of its divisors is an integer number (293369461).

Almost surely, 2^1154550721 is an apocalyptic number.

It is an amenable number.

1154550721 is a deficient number, since it is larger than the sum of its proper divisors (18927123).

1154550721 is an equidigital number, since it uses as much as digits as its factorization.

1154550721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18927122.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 1154550721 is about 33978.6803893265. The cubic root of 1154550721 is about 1049.0696887517.

The spelling of 1154550721 in words is "one billion, one hundred fifty-four million, five hundred fifty thousand, seven hundred twenty-one".