51163771 has 4 divisors (see below), whose sum is σ = 51383592. Its totient is φ = 50943952.

The previous prime is 51163759. The next prime is 51163781. The reversal of 51163771 is 17736115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17736115 = 5 ⋅3547223.

It is a cyclic number.

It is not a de Polignac number, because 51163771 - 2⁷ = 51163643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51163741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109561 + ... + 110026.

It is an arithmetic number, because the mean of its divisors is an integer number (12845898).

Almost surely, 2^51163771 is an apocalyptic number.

51163771 is a deficient number, since it is larger than the sum of its proper divisors (219821).

51163771 is a wasteful number, since it uses less digits than its factorization.

51163771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219820.

The product of its digits is 4410, while the sum is 31.

The square root of 51163771 is about 7152.8855016699. The cubic root of 51163771 is about 371.2395026262.

Adding to 51163771 its reverse (17736115), we get a palindrome (68899886).

The spelling of 51163771 in words is "fifty-one million, one hundred sixty-three thousand, seven hundred seventy-one".