1129311720 has 80 divisors (see below), whose sum is σ = 3795753060. Its totient is φ = 301148928.

The previous prime is 1129311719. The next prime is 1129311731. The reversal of 1129311720 is 271139211.

It can be written as a sum of positive squares in 2 ways, for example, as 1069682436 + 59629284 = 32706^2 + 7722^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 171037 + ... + 177516.

Almost surely, 2^1129311720 is an apocalyptic number.

1129311720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1129311720 is an abundant number, since it is smaller than the sum of its proper divisors (2666441340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1129311720 is a wasteful number, since it uses less digits than its factorization.

1129311720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348576 (or 348563 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 1129311720 is about 33605.2335209860. The cubic root of 1129311720 is about 1041.3689197294.

The spelling of 1129311720 in words is "one billion, one hundred twenty-nine million, three hundred eleven thousand, seven hundred twenty".