51443749 has 16 divisors (see below), whose sum is σ = 59811840. Its totient is φ = 43338240.

The previous prime is 51443747. The next prime is 51443753. The reversal of 51443749 is 94734415.

It is a cyclic number.

It is not a de Polignac number, because 51443749 - 2¹ = 51443747 is a prime.

It is a super-2 number, since 2×51443749² = 5292918622350002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51443747) 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 15 ways as a sum of consecutive naturals, for example, 145557 + ... + 145909.

It is an arithmetic number, because the mean of its divisors is an integer number (3738240).

Almost surely, 2^51443749 is an apocalyptic number.

It is an amenable number.

51443749 is a deficient number, since it is larger than the sum of its proper divisors (8368091).

51443749 is a wasteful number, since it uses less digits than its factorization.

51443749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 60480, while the sum is 37.

The square root of 51443749 is about 7172.4297835531. The cubic root of 51443749 is about 371.9154358403.

The spelling of 51443749 in words is "fifty-one million, four hundred forty-three thousand, seven hundred forty-nine".