123130297891 has 4 divisors (see below), whose sum is σ = 123867605232. Its totient is φ = 122392990552.

The previous prime is 123130297817. The next prime is 123130297903. The reversal of 123130297891 is 198792031321.

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 123130297891 - 2³¹ = 120982814243 is a prime.

It is a super-2 number, since 2×123130297891² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123130297391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368653420 + ... + 368653753.

It is an arithmetic number, because the mean of its divisors is an integer number (30966901308).

Almost surely, 2^123130297891 is an apocalyptic number.

123130297891 is a deficient number, since it is larger than the sum of its proper divisors (737307341).

123130297891 is an equidigital number, since it uses as much as digits as its factorization.

123130297891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737307340.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 123130297891 in words is "one hundred twenty-three billion, one hundred thirty million, two hundred ninety-seven thousand, eight hundred ninety-one".