51046661 has 4 divisors (see below), whose sum is σ = 51084300. Its totient is φ = 51009024.

The previous prime is 51046649. The next prime is 51046663. The reversal of 51046661 is 16664015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10278436 + 40768225 = 3206^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 51046661 - 2¹⁰ = 51045637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51046663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16706 + ... + 19523.

It is an arithmetic number, because the mean of its divisors is an integer number (12771075).

Almost surely, 2^51046661 is an apocalyptic number.

It is an amenable number.

51046661 is a deficient number, since it is larger than the sum of its proper divisors (37639).

51046661 is a wasteful number, since it uses less digits than its factorization.

51046661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37638.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 51046661 is about 7144.6946050898. The cubic root of 51046661 is about 370.9560398651.

The spelling of 51046661 in words is "fifty-one million, forty-six thousand, six hundred sixty-one".