1129025721 has 8 divisors (see below), whose sum is σ = 1505628544. Its totient is φ = 752553360.

The previous prime is 1129025719. The next prime is 1129025753. The reversal of 1129025721 is 1275209211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1129025721 - 2¹ = 1129025719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1129021721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10225 + ... + 48606.

It is an arithmetic number, because the mean of its divisors is an integer number (188203568).

Almost surely, 2^1129025721 is an apocalyptic number.

It is an amenable number.

1129025721 is a deficient number, since it is larger than the sum of its proper divisors (376602823).

1129025721 is an equidigital number, since it uses as much as digits as its factorization.

1129025721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65231.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1129025721 is about 33600.9779768387. The cubic root of 1129025721 is about 1041.2810031664.

The spelling of 1129025721 in words is "one billion, one hundred twenty-nine million, twenty-five thousand, seven hundred twenty-one".