1213025123 has 4 divisors (see below), whose sum is σ = 1284379560. Its totient is φ = 1141670688.

The previous prime is 1213025119. The next prime is 1213025153. The reversal of 1213025123 is 3215203121.

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 1213025123 - 2² = 1213025119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213025095 and 1213025104.

It is not an unprimeable number, because it can be changed into a prime (1213025153) 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, 35677193 + ... + 35677226.

It is an arithmetic number, because the mean of its divisors is an integer number (321094890).

Almost surely, 2^1213025123 is an apocalyptic number.

1213025123 is a deficient number, since it is larger than the sum of its proper divisors (71354437).

1213025123 is an equidigital number, since it uses as much as digits as its factorization.

1213025123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71354436.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1213025123 is about 34828.5102035674. The cubic root of 1213025123 is about 1066.4895357022.

Adding to 1213025123 its reverse (3215203121), we get a palindrome (4428228244).

The spelling of 1213025123 in words is "one billion, two hundred thirteen million, twenty-five thousand, one hundred twenty-three".