51139810 has 16 divisors (see below), whose sum is σ = 96054336. Its totient is φ = 19566448.

The previous prime is 51139793. The next prime is 51139813. The reversal of 51139810 is 1893115.

It is a super-2 number, since 2×51139810² = 5230560333672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51139813) 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 7 ways as a sum of consecutive naturals, for example, 110944 + ... + 111403.

It is an arithmetic number, because the mean of its divisors is an integer number (6003396).

Almost surely, 2^51139810 is an apocalyptic number.

51139810 is a deficient number, since it is larger than the sum of its proper divisors (44914526).

51139810 is a wasteful number, since it uses less digits than its factorization.

51139810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222377.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 51139810 is about 7151.2103870604. The cubic root of 51139810 is about 371.1815406574.

The spelling of 51139810 in words is "fifty-one million, one hundred thirty-nine thousand, eight hundred ten".