51549786 has 12 divisors (see below), whose sum is σ = 111691242. Its totient is φ = 17183256.

The previous prime is 51549767. The next prime is 51549787. The reversal of 51549786 is 68794515.

It can be written as a sum of positive squares in only one way, i.e., 46172025 + 5377761 = 6795^2 + 2319^2 .

It is not an unprimeable number, because it can be changed into a prime (51549787) 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, 1431921 + ... + 1431956.

Almost surely, 2^51549786 is an apocalyptic number.

51549786 is an abundant number, since it is smaller than the sum of its proper divisors (60141456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51549786 is a wasteful number, since it uses less digits than its factorization.

51549786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863885 (or 2863882 counting only the distinct ones).

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

The square root of 51549786 is about 7179.8179642662. The cubic root of 51549786 is about 372.1707939277.

The spelling of 51549786 in words is "fifty-one million, five hundred forty-nine thousand, seven hundred eighty-six".