1311877951 has 2 divisors, whose sum is σ = 1311877952. Its totient is φ = 1311877950.

The previous prime is 1311877939. The next prime is 1311877999. The reversal of 1311877951 is 1597781131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1597781131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311877951 - 2⁷ = 1311877823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311877898 and 1311877907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311877051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655938975 + 655938976.

It is an arithmetic number, because the mean of its divisors is an integer number (655938976).

Almost surely, 2^1311877951 is an apocalyptic number.

1311877951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311877951 is an equidigital number, since it uses as much as digits as its factorization.

1311877951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 43.

The square root of 1311877951 is about 36219.8557562009. The cubic root of 1311877951 is about 1094.7067877658.

The spelling of 1311877951 in words is "one billion, three hundred eleven million, eight hundred seventy-seven thousand, nine hundred fifty-one".