51267749 has 4 divisors (see below), whose sum is σ = 55211436. Its totient is φ = 47324064.

The previous prime is 51267673. The next prime is 51267779. The reversal of 51267749 is 94776215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3062500 + 48205249 = 1750^2 + 6943^2 .

It is a cyclic number.

It is not a de Polignac number, because 51267749 - 2⁸ = 51267493 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 (51267779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971824 + ... + 1971849.

It is an arithmetic number, because the mean of its divisors is an integer number (13802859).

Almost surely, 2^51267749 is an apocalyptic number.

It is an amenable number.

51267749 is a deficient number, since it is larger than the sum of its proper divisors (3943687).

51267749 is a wasteful number, since it uses less digits than its factorization.

51267749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943686.

The product of its digits is 105840, while the sum is 41.

The square root of 51267749 is about 7160.1500682597. The cubic root of 51267749 is about 371.4908173152.

The spelling of 51267749 in words is "fifty-one million, two hundred sixty-seven thousand, seven hundred forty-nine".