51185567 has 2 divisors, whose sum is σ = 51185568. Its totient is φ = 51185566.

The previous prime is 51185531. The next prime is 51185569. The reversal of 51185567 is 76558115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51185567 - 2⁶ = 51185503 is a prime.

It is a super-2 number, since 2×51185567² = 5239924538222978, which contains 22 as substring.

Together with 51185569, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51185567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51185569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25592783 + 25592784.

It is an arithmetic number, because the mean of its divisors is an integer number (25592784).

Almost surely, 2^51185567 is an apocalyptic number.

51185567 is a deficient number, since it is larger than the sum of its proper divisors (1).

51185567 is an equidigital number, since it uses as much as digits as its factorization.

51185567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 38.

The square root of 51185567 is about 7154.4089203791. The cubic root of 51185567 is about 371.2922117164.

The spelling of 51185567 in words is "fifty-one million, one hundred eighty-five thousand, five hundred sixty-seven".