1129720645 has 16 divisors (see below), whose sum is σ = 1364014080. Its totient is φ = 898228800.

The previous prime is 1129720643. The next prime is 1129720663. The reversal of 1129720645 is 5460279211.

It is not a de Polignac number, because 1129720645 - 2¹ = 1129720643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129720643) 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, 767260 + ... + 768730.

It is an arithmetic number, because the mean of its divisors is an integer number (85250880).

Almost surely, 2^1129720645 is an apocalyptic number.

It is an amenable number.

1129720645 is a deficient number, since it is larger than the sum of its proper divisors (234293435).

1129720645 is a wasteful number, since it uses less digits than its factorization.

1129720645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1129720645 is about 33611.3172160807. The cubic root of 1129720645 is about 1041.4945981667.

Adding to 1129720645 its reverse (5460279211), we get a palindrome (6589999856).

The spelling of 1129720645 in words is "one billion, one hundred twenty-nine million, seven hundred twenty thousand, six hundred forty-five".