51257771 has 4 divisors (see below), whose sum is σ = 54272952. Its totient is φ = 48242592.

The previous prime is 51257743. The next prime is 51257797. The reversal of 51257771 is 17775215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17775215 = 5 ⋅3555043.

It is a cyclic number.

It is not a de Polignac number, because 51257771 - 2⁶ = 51257707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51257071) 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, 1507565 + ... + 1507598.

It is an arithmetic number, because the mean of its divisors is an integer number (13568238).

Almost surely, 2^51257771 is an apocalyptic number.

51257771 is a deficient number, since it is larger than the sum of its proper divisors (3015181).

51257771 is a wasteful number, since it uses less digits than its factorization.

51257771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015180.

The product of its digits is 17150, while the sum is 35.

The square root of 51257771 is about 7159.4532612484. The cubic root of 51257771 is about 371.4667152501.

The spelling of 51257771 in words is "fifty-one million, two hundred fifty-seven thousand, seven hundred seventy-one".