51161571 has 8 divisors (see below), whose sum is σ = 75794960. Its totient is φ = 34107696.

The previous prime is 51161557. The next prime is 51161573. The reversal of 51161571 is 17516115.

It is a happy number.

51161571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51161571 - 2¹¹ = 51159523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1894873 = 51161571 / (5 + 1 + 1 + 6 + 1 + 5 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947410 + ... + 947463.

It is an arithmetic number, because the mean of its divisors is an integer number (9474370).

Almost surely, 2^51161571 is an apocalyptic number.

51161571 is a deficient number, since it is larger than the sum of its proper divisors (24633389).

51161571 is a wasteful number, since it uses less digits than its factorization.

51161571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894882 (or 1894876 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 51161571 is about 7152.7317159250. The cubic root of 51161571 is about 371.2341815523.

Adding to 51161571 its reverse (17516115), we get a palindrome (68677686).

The spelling of 51161571 in words is "fifty-one million, one hundred sixty-one thousand, five hundred seventy-one".