51240105 has 48 divisors (see below), whose sum is σ = 103693824. Its totient is φ = 22919040.

The previous prime is 51240103. The next prime is 51240121. The reversal of 51240105 is 50104215.

It is not a de Polignac number, because 51240105 - 2¹ = 51240103 is a prime.

It is a super-2 number, since 2×51240105² = 5251096720822050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13075 + ... + 16535.

It is an arithmetic number, because the mean of its divisors is an integer number (2160288).

Almost surely, 2^51240105 is an apocalyptic number.

It is an amenable number.

51240105 is an abundant number, since it is smaller than the sum of its proper divisors (52453719).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51240105 is a wasteful number, since it uses less digits than its factorization.

51240105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526 (or 3523 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51240105 is about 7158.2194014992. The cubic root of 51240105 is about 371.4240349897.

The spelling of 51240105 in words is "fifty-one million, two hundred forty thousand, one hundred five".