1213351403 has 4 divisors (see below), whose sum is σ = 1323656088. Its totient is φ = 1103046720.

The previous prime is 1213351393. The next prime is 1213351409. The reversal of 1213351403 is 3041533121.

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 1213351403 - 2⁸ = 1213351147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213351409) 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, 55152326 + ... + 55152347.

It is an arithmetic number, because the mean of its divisors is an integer number (330914022).

Almost surely, 2^1213351403 is an apocalyptic number.

1213351403 is a deficient number, since it is larger than the sum of its proper divisors (110304685).

1213351403 is a wasteful number, since it uses less digits than its factorization.

1213351403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110304684.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1213351403 is about 34833.1939821774. The cubic root of 1213351403 is about 1066.5851487291.

Adding to 1213351403 its reverse (3041533121), we get a palindrome (4254884524).

It can be divided in two parts, 12133 and 51403, that added together give a palindrome (63536).

The spelling of 1213351403 in words is "one billion, two hundred thirteen million, three hundred fifty-one thousand, four hundred three".