1311421051 has 4 divisors (see below), whose sum is σ = 1312214152. Its totient is φ = 1310627952.

The previous prime is 1311421043. The next prime is 1311421063. The reversal of 1311421051 is 1501241131.

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 1311421051 - 2³ = 1311421043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311421031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394065 + ... + 397378.

It is an arithmetic number, because the mean of its divisors is an integer number (328053538).

Almost surely, 2^1311421051 is an apocalyptic number.

1311421051 is a deficient number, since it is larger than the sum of its proper divisors (793101).

1311421051 is an equidigital number, since it uses as much as digits as its factorization.

1311421051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793100.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1311421051 is about 36213.5478930193. The cubic root of 1311421051 is about 1094.5796850861.

Adding to 1311421051 its reverse (1501241131), we get a palindrome (2812662182).

The spelling of 1311421051 in words is "one billion, three hundred eleven million, four hundred twenty-one thousand, fifty-one".