1312121103 has 4 divisors (see below), whose sum is σ = 1749494808. Its totient is φ = 874747400.

The previous prime is 1312121101. The next prime is 1312121131. The reversal of 1312121103 is 3011212131.

It is a happy number.

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 1312121103 - 2¹ = 1312121101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312121101) 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, 218686848 + ... + 218686853.

It is an arithmetic number, because the mean of its divisors is an integer number (437373702).

Almost surely, 2^1312121103 is an apocalyptic number.

1312121103 is a deficient number, since it is larger than the sum of its proper divisors (437373705).

1312121103 is an equidigital number, since it uses as much as digits as its factorization.

1312121103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437373704.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1312121103 is about 36223.2122126131. The cubic root of 1312121103 is about 1094.7744169486.

Adding to 1312121103 its reverse (3011212131), we get a palindrome (4323333234).

The spelling of 1312121103 in words is "one billion, three hundred twelve million, one hundred twenty-one thousand, one hundred three".