51442065 has 24 divisors (see below), whose sum is σ = 90852840. Its totient is φ = 26916864.

The previous prime is 51442057. The next prime is 51442073. The reversal of 51442065 is 56024415.

It is an interprime number because it is at equal distance from previous prime (51442057) and next prime (51442073).

It can be written as a sum of positive squares in 4 ways, for example, as 804609 + 50637456 = 897^2 + 7116^2 .

It is not a de Polignac number, because 51442065 - 2³ = 51442057 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 8400 + ... + 13169.

It is an arithmetic number, because the mean of its divisors is an integer number (3785535).

Almost surely, 2^51442065 is an apocalyptic number.

It is an amenable number.

51442065 is a deficient number, since it is larger than the sum of its proper divisors (39410775).

51442065 is a wasteful number, since it uses less digits than its factorization.

51442065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21633 (or 21630 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 51442065 is about 7172.3123886234. The cubic root of 51442065 is about 371.9113776056.

The spelling of 51442065 in words is "fifty-one million, four hundred forty-two thousand, sixty-five".