51268691 has 2 divisors, whose sum is σ = 51268692. Its totient is φ = 51268690.

The previous prime is 51268639. The next prime is 51268697. The reversal of 51268691 is 19686215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51268691 - 2¹⁴ = 51252307 is a prime.

It is not a weakly prime, because it can be changed into another prime (51268697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25634345 + 25634346.

It is an arithmetic number, because the mean of its divisors is an integer number (25634346).

Almost surely, 2^51268691 is an apocalyptic number.

51268691 is a deficient number, since it is larger than the sum of its proper divisors (1).

51268691 is an equidigital number, since it uses as much as digits as its factorization.

51268691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 51268691 is about 7160.2158487018. The cubic root of 51268691 is about 371.4930925741.

The spelling of 51268691 in words is "fifty-one million, two hundred sixty-eight thousand, six hundred ninety-one".