51811490 has 16 divisors (see below), whose sum is σ = 93398400. Its totient is φ = 20694000.

The previous prime is 51811489. The next prime is 51811519. The reversal of 51811490 is 9411815.

It is an unprimeable number.

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, 4061 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (5837400).

Almost surely, 2^51811490 is an apocalyptic number.

51811490 is a deficient number, since it is larger than the sum of its proper divisors (41586910).

51811490 is a wasteful number, since it uses less digits than its factorization.

51811490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7657.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 51811490 is about 7198.0198666022. The cubic root of 51811490 is about 372.7995338599.

The spelling of 51811490 in words is "fifty-one million, eight hundred eleven thousand, four hundred ninety".