51966749 has 4 divisors (see below), whose sum is σ = 52376064. Its totient is φ = 51557436.

The previous prime is 51966737. The next prime is 51966769. The reversal of 51966749 is 94766915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51966749 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 (51966709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204467 + ... + 204720.

It is an arithmetic number, because the mean of its divisors is an integer number (13094016).

Almost surely, 2^51966749 is an apocalyptic number.

It is an amenable number.

51966749 is a deficient number, since it is larger than the sum of its proper divisors (409315).

51966749 is a wasteful number, since it uses less digits than its factorization.

51966749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409314.

The product of its digits is 408240, while the sum is 47.

The square root of 51966749 is about 7208.7966402167. The cubic root of 51966749 is about 373.1715412000.

The spelling of 51966749 in words is "fifty-one million, nine hundred sixty-six thousand, seven hundred forty-nine".