51749505 has 12 divisors (see below), whose sum is σ = 89699220. Its totient is φ = 27599712.

The previous prime is 51749497. The next prime is 51749507. The reversal of 51749505 is 50594715.

It can be written as a sum of positive squares in 2 ways, for example, as 33907329 + 17842176 = 5823^2 + 4224^2 .

It is not a de Polignac number, because 51749505 - 2³ = 51749497 is a prime.

It is a super-2 number, since 2×51749505² = 5356022535490050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51749505.

It is not an unprimeable number, because it can be changed into a prime (51749507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574950 + ... + 575039.

It is an arithmetic number, because the mean of its divisors is an integer number (7474935).

Almost surely, 2^51749505 is an apocalyptic number.

It is an amenable number.

51749505 is a deficient number, since it is larger than the sum of its proper divisors (37949715).

51749505 is a wasteful number, since it uses less digits than its factorization.

51749505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150000 (or 1149997 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 51749505 is about 7193.7128800085. The cubic root of 51749505 is about 372.6508075165.

The spelling of 51749505 in words is "fifty-one million, seven hundred forty-nine thousand, five hundred five".