1213125123 has 8 divisors (see below), whose sum is σ = 1848571648. Its totient is φ = 693214344.

The previous prime is 1213125079. The next prime is 1213125127. The reversal of 1213125123 is 3215213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213125123 - 2⁶ = 1213125059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 57767863 = 1213125123 / (1 + 2 + 1 + 3 + 1 + 2 + 5 + 1 + 2 + 3).

It is a self number, because there is not a number n which added to its sum of digits gives 1213125123.

It is not an unprimeable number, because it can be changed into a prime (1213125127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28883911 + ... + 28883952.

It is an arithmetic number, because the mean of its divisors is an integer number (231071456).

Almost surely, 2^1213125123 is an apocalyptic number.

1213125123 is a deficient number, since it is larger than the sum of its proper divisors (635446525).

1213125123 is an equidigital number, since it uses as much as digits as its factorization.

1213125123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57767873.

The product of its digits is 360, while the sum is 21.

The square root of 1213125123 is about 34829.9457794582. The cubic root of 1213125123 is about 1066.5188415045.

Adding to 1213125123 its reverse (3215213121), we get a palindrome (4428338244).

The spelling of 1213125123 in words is "one billion, two hundred thirteen million, one hundred twenty-five thousand, one hundred twenty-three".