51689156 has 6 divisors (see below), whose sum is σ = 90456030. Its totient is φ = 25844576.

The previous prime is 51689149. The next prime is 51689159. The reversal of 51689156 is 65198615.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 2464900 = 7016^2 + 1570^2 .

It is not an unprimeable number, because it can be changed into a prime (51689159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6461141 + ... + 6461148.

It is an arithmetic number, because the mean of its divisors is an integer number (15076005).

Almost surely, 2^51689156 is an apocalyptic number.

It is an amenable number.

51689156 is a deficient number, since it is larger than the sum of its proper divisors (38766874).

51689156 is a wasteful number, since it uses less digits than its factorization.

51689156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12922293 (or 12922291 counting only the distinct ones).

The product of its digits is 64800, while the sum is 41.

The square root of 51689156 is about 7189.5170908761. The cubic root of 51689156 is about 372.5058924342.

The spelling of 51689156 in words is "fifty-one million, six hundred eighty-nine thousand, one hundred fifty-six".