1149288721 has 16 divisors (see below), whose sum is σ = 1335628800. Its totient is φ = 968544720.

The previous prime is 1149288677. The next prime is 1149288727. The reversal of 1149288721 is 1278829411.

It is a cyclic number.

It is not a de Polignac number, because 1149288721 - 2⁷ = 1149288593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1149288727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278886 + ... + 282976.

It is an arithmetic number, because the mean of its divisors is an integer number (83476800).

Almost surely, 2^1149288721 is an apocalyptic number.

It is an amenable number.

1149288721 is a deficient number, since it is larger than the sum of its proper divisors (186340079).

1149288721 is an equidigital number, since it uses as much as digits as its factorization.

1149288721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4764.

The product of its digits is 64512, while the sum is 43.

The square root of 1149288721 is about 33901.1610568134. The cubic root of 1149288721 is about 1047.4735087465.

The spelling of 1149288721 in words is "one billion, one hundred forty-nine million, two hundred eighty-eight thousand, seven hundred twenty-one".