1147720123 has 4 divisors (see below), whose sum is σ = 1252058328. Its totient is φ = 1043381920.

The previous prime is 1147720073. The next prime is 1147720127. The reversal of 1147720123 is 3210277411.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1147720123 is a prime.

It is a super-2 number, since 2×1147720123² = 2634522961478270258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1147720091 and 1147720100.

It is not an unprimeable number, because it can be changed into a prime (1147720127) 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, 52169086 + ... + 52169107.

It is an arithmetic number, because the mean of its divisors is an integer number (313014582).

Almost surely, 2^1147720123 is an apocalyptic number.

1147720123 is a deficient number, since it is larger than the sum of its proper divisors (104338205).

1147720123 is a wasteful number, since it uses less digits than its factorization.

1147720123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104338204.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 1147720123 is about 33878.0182861985. The cubic root of 1147720123 is about 1046.9967463524.

Adding to 1147720123 its reverse (3210277411), we get a palindrome (4357997534).

The spelling of 1147720123 in words is "one billion, one hundred forty-seven million, seven hundred twenty thousand, one hundred twenty-three".