51549687 has 12 divisors (see below), whose sum is σ = 85098000. Its totient is φ = 29456928.

The previous prime is 51549653. The next prime is 51549689. The reversal of 51549687 is 78694515.

It is not a de Polignac number, because 51549687 - 2⁶ = 51549623 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51549689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409062 + ... + 409187.

It is an arithmetic number, because the mean of its divisors is an integer number (7091500).

Almost surely, 2^51549687 is an apocalyptic number.

51549687 is a deficient number, since it is larger than the sum of its proper divisors (33548313).

51549687 is a wasteful number, since it uses less digits than its factorization.

51549687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818262 (or 818259 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 51549687 is about 7179.8110699377. The cubic root of 51549687 is about 372.1705556795.

It can be divided in two parts, 5154 and 9687, that added together give a palindrome (14841).

The spelling of 51549687 in words is "fifty-one million, five hundred forty-nine thousand, six hundred eighty-seven".