1123820731281 has 4 divisors (see below), whose sum is σ = 1498427641712. Its totient is φ = 749213820852.

The previous prime is 1123820731223. The next prime is 1123820731303. The reversal of 1123820731281 is 1821370283211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1123820731281 - 2¹³ = 1123820723089 is a prime.

It is a super-2 number, since 2×1123820731281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123820730281) 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, 187303455211 + ... + 187303455216.

It is an arithmetic number, because the mean of its divisors is an integer number (374606910428).

Almost surely, 2^{1123820731281} is an apocalyptic number.

It is an amenable number.

1123820731281 is a deficient number, since it is larger than the sum of its proper divisors (374606910431).

1123820731281 is an equidigital number, since it uses as much as digits as its factorization.

1123820731281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374606910430.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 1123820731281 in words is "one trillion, one hundred twenty-three billion, eight hundred twenty million, seven hundred thirty-one thousand, two hundred eighty-one".