51311291 has 2 divisors, whose sum is σ = 51311292. Its totient is φ = 51311290.

The previous prime is 51311269. The next prime is 51311303. The reversal of 51311291 is 19211315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51311291 is a prime.

It is not a weakly prime, because it can be changed into another prime (51311591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25655645 + 25655646.

It is an arithmetic number, because the mean of its divisors is an integer number (25655646).

Almost surely, 2^51311291 is an apocalyptic number.

51311291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51311291 is an equidigital number, since it uses as much as digits as its factorization.

51311291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 23.

The square root of 51311291 is about 7163.1900016683. The cubic root of 51311291 is about 371.5959573323.

The spelling of 51311291 in words is "fifty-one million, three hundred eleven thousand, two hundred ninety-one".