51009646 has 16 divisors (see below), whose sum is σ = 78446160. Its totient is φ = 24868800.

The previous prime is 51009641. The next prime is 51009659. The reversal of 51009646 is 64690015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51009641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11650 + ... + 15418.

It is an arithmetic number, because the mean of its divisors is an integer number (4902885).

Almost surely, 2^51009646 is an apocalyptic number.

51009646 is a deficient number, since it is larger than the sum of its proper divisors (27436514).

51009646 is a wasteful number, since it uses less digits than its factorization.

51009646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51009646 is about 7142.1037516967. The cubic root of 51009646 is about 370.8663555270.

The spelling of 51009646 in words is "fifty-one million, nine thousand, six hundred forty-six".