51505739 has 16 divisors (see below), whose sum is σ = 54340608. Its totient is φ = 48771072.

The previous prime is 51505703. The next prime is 51505759. The reversal of 51505739 is 93750515.

51505739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51505739 - 2¹⁶ = 51440203 is a prime.

It is a super-2 number, since 2×51505739² = 5305682299872242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51505699 and 51505708.

It is not an unprimeable number, because it can be changed into a prime (51505759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405494 + ... + 405620.

It is an arithmetic number, because the mean of its divisors is an integer number (3396288).

Almost surely, 2^51505739 is an apocalyptic number.

51505739 is a deficient number, since it is larger than the sum of its proper divisors (2834869).

51505739 is a wasteful number, since it uses less digits than its factorization.

51505739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 23625, while the sum is 35.

The square root of 51505739 is about 7176.7498911415. The cubic root of 51505739 is about 372.0647625906.

The spelling of 51505739 in words is "fifty-one million, five hundred five thousand, seven hundred thirty-nine".