51011646 has 40 divisors (see below), whose sum is σ = 119053704. Its totient is φ = 14570640.

The previous prime is 51011629. The next prime is 51011657. The reversal of 51011646 is 64611015.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 12636 + ... + 16176.

Almost surely, 2^51011646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51011646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59526852).

51011646 is an abundant number, since it is smaller than the sum of its proper divisors (68042058).

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

51011646 is an equidigital number, since it uses as much as digits as its factorization.

51011646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 51011646 is about 7142.2437650923. The cubic root of 51011646 is about 370.8712024731.

The spelling of 51011646 in words is "fifty-one million, eleven thousand, six hundred forty-six".