51091567 has 2 divisors, whose sum is σ = 51091568. Its totient is φ = 51091566.

The previous prime is 51091543. The next prime is 51091609. The reversal of 51091567 is 76519015.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51091567 is a prime.

It is a super-2 number, since 2×51091567² = 5220696437030978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51091517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25545783 + 25545784.

It is an arithmetic number, because the mean of its divisors is an integer number (25545784).

Almost surely, 2^51091567 is an apocalyptic number.

51091567 is a deficient number, since it is larger than the sum of its proper divisors (1).

51091567 is an equidigital number, since it uses as much as digits as its factorization.

51091567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 51091567 is about 7147.8365258307. The cubic root of 51091567 is about 371.0647852707.

The spelling of 51091567 in words is "fifty-one million, ninety-one thousand, five hundred sixty-seven".