1129857023 has 4 divisors (see below), whose sum is σ = 1168817640. Its totient is φ = 1090896408.

The previous prime is 1129856999. The next prime is 1129857073. The reversal of 1129857023 is 3207589211.

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

It is a cyclic number.

It is not a de Polignac number, because 1129857023 - 2¹⁰ = 1129855999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129857073) 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, 19480265 + ... + 19480322.

It is an arithmetic number, because the mean of its divisors is an integer number (292204410).

Almost surely, 2^1129857023 is an apocalyptic number.

1129857023 is a deficient number, since it is larger than the sum of its proper divisors (38960617).

1129857023 is an equidigital number, since it uses as much as digits as its factorization.

1129857023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38960616.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1129857023 is about 33613.3459060534. The cubic root of 1129857023 is about 1041.5365056465.

The spelling of 1129857023 in words is "one billion, one hundred twenty-nine million, eight hundred fifty-seven thousand, twenty-three".