51667331 has 2 divisors, whose sum is σ = 51667332. Its totient is φ = 51667330.

The previous prime is 51667313. The next prime is 51667333. The reversal of 51667331 is 13376615.

Together with previous prime (51667313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51667331 - 2¹⁸ = 51405187 is a prime.

It is a super-2 number, since 2×51667331² = 5339026185327122, which contains 22 as substring.

Together with 51667333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51667333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25833665 + 25833666.

It is an arithmetic number, because the mean of its divisors is an integer number (25833666).

Almost surely, 2^51667331 is an apocalyptic number.

51667331 is a deficient number, since it is larger than the sum of its proper divisors (1).

51667331 is an equidigital number, since it uses as much as digits as its factorization.

51667331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 51667331 is about 7187.9990957150. Note that the first 3 decimals coincide. The cubic root of 51667331 is about 372.4534566414.

The spelling of 51667331 in words is "fifty-one million, six hundred sixty-seven thousand, three hundred thirty-one".