51811156 has 6 divisors (see below), whose sum is σ = 90669530. Its totient is φ = 25905576.

The previous prime is 51811153. The next prime is 51811171. The reversal of 51811156 is 65111815.

It can be written as a sum of positive squares in only one way, i.e., 46703556 + 5107600 = 6834^2 + 2260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51811153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6476391 + ... + 6476398.

Almost surely, 2^51811156 is an apocalyptic number.

It is an amenable number.

51811156 is a deficient number, since it is larger than the sum of its proper divisors (38858374).

51811156 is a wasteful number, since it uses less digits than its factorization.

51811156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12952793 (or 12952791 counting only the distinct ones).

The product of its digits is 1200, while the sum is 28.

The square root of 51811156 is about 7197.9966657397. The cubic root of 51811156 is about 372.7987327807.

The spelling of 51811156 in words is "fifty-one million, eight hundred eleven thousand, one hundred fifty-six".