1311402551 has 4 divisors (see below), whose sum is σ = 1314247704. Its totient is φ = 1308557400.

The previous prime is 1311402539. The next prime is 1311402563. The reversal of 1311402551 is 1552041131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1552041131 = 67 ⋅23164793.

It is an interprime number because it is at equal distance from previous prime (1311402539) and next prime (1311402563).

It is a cyclic number.

It is not a de Polignac number, because 1311402551 - 2¹⁸ = 1311140407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311402511) 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, 1421885 + ... + 1422806.

It is an arithmetic number, because the mean of its divisors is an integer number (328561926).

Almost surely, 2^1311402551 is an apocalyptic number.

1311402551 is a deficient number, since it is larger than the sum of its proper divisors (2845153).

1311402551 is an equidigital number, since it uses as much as digits as its factorization.

1311402551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845152.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1311402551 is about 36213.2924628513. The cubic root of 1311402551 is about 1094.5745380436.

Adding to 1311402551 its reverse (1552041131), we get a palindrome (2863443682).

The spelling of 1311402551 in words is "one billion, three hundred eleven million, four hundred two thousand, five hundred fifty-one".