51581171 has 2 divisors, whose sum is σ = 51581172. Its totient is φ = 51581170.

The previous prime is 51581149. The next prime is 51581191. The reversal of 51581171 is 17118515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51581171 - 2¹⁰ = 51580147 is a prime.

It is not a weakly prime, because it can be changed into another prime (51581191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25790585 + 25790586.

It is an arithmetic number, because the mean of its divisors is an integer number (25790586).

Almost surely, 2^51581171 is an apocalyptic number.

51581171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51581171 is an equidigital number, since it uses as much as digits as its factorization.

51581171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 29.

The square root of 51581171 is about 7182.0032720683. The cubic root of 51581171 is about 372.2463080509.

Adding to 51581171 its reverse (17118515), we get a palindrome (68699686).

The spelling of 51581171 in words is "fifty-one million, five hundred eighty-one thousand, one hundred seventy-one".