1316121403 has 4 divisors (see below), whose sum is σ = 1316519848. Its totient is φ = 1315722960.

The previous prime is 1316121377. The next prime is 1316121427. The reversal of 1316121403 is 3041216131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316121403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1316121473) 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, 194226 + ... + 200887.

It is an arithmetic number, because the mean of its divisors is an integer number (329129962).

Almost surely, 2^1316121403 is an apocalyptic number.

1316121403 is a deficient number, since it is larger than the sum of its proper divisors (398445).

1316121403 is an equidigital number, since it uses as much as digits as its factorization.

1316121403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398444.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1316121403 is about 36278.3875468577. The cubic root of 1316121403 is about 1095.8858446091.

Adding to 1316121403 its reverse (3041216131), we get a palindrome (4357337534).

The spelling of 1316121403 in words is "one billion, three hundred sixteen million, one hundred twenty-one thousand, four hundred three".