51556771 has 6 divisors (see below), whose sum is σ = 59974260. Its totient is φ = 44191476.

The previous prime is 51556717. The next prime is 51556787. The reversal of 51556771 is 17765515.

It is not a de Polignac number, because 51556771 - 2⁷ = 51556643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51556771.

It is not an unprimeable number, because it can be changed into a prime (51556471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 526041 + ... + 526138.

It is an arithmetic number, because the mean of its divisors is an integer number (9995710).

Almost surely, 2^51556771 is an apocalyptic number.

51556771 is a deficient number, since it is larger than the sum of its proper divisors (8417489).

51556771 is a wasteful number, since it uses less digits than its factorization.

51556771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052193 (or 1052186 counting only the distinct ones).

The product of its digits is 36750, while the sum is 37.

The square root of 51556771 is about 7180.3043807348. The cubic root of 51556771 is about 372.1876028923.

The spelling of 51556771 in words is "fifty-one million, five hundred fifty-six thousand, seven hundred seventy-one".