51281237 has 16 divisors (see below), whose sum is σ = 61378560. Its totient is φ = 41890992.

The previous prime is 51281233. The next prime is 51281239. The reversal of 51281237 is 73218215.

It is a cyclic number.

It is not a de Polignac number, because 51281237 - 2² = 51281233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51281233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70964 + ... + 71682.

It is an arithmetic number, because the mean of its divisors is an integer number (3836160).

Almost surely, 2^51281237 is an apocalyptic number.

It is an amenable number.

51281237 is a deficient number, since it is larger than the sum of its proper divisors (10097323).

51281237 is a wasteful number, since it uses less digits than its factorization.

51281237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192.

The product of its digits is 3360, while the sum is 29.

The square root of 51281237 is about 7161.0918860185. The cubic root of 51281237 is about 371.5233928875.

The spelling of 51281237 in words is "fifty-one million, two hundred eighty-one thousand, two hundred thirty-seven".