51118646 has 4 divisors (see below), whose sum is σ = 76677972. Its totient is φ = 25559322.

The previous prime is 51118637. The next prime is 51118699. The reversal of 51118646 is 64681115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64681115 = 5 ⋅12936223.

It is a super-2 number, since 2×51118646² = 5226231937746632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779660 + ... + 12779663.

It is an arithmetic number, because the mean of its divisors is an integer number (19169493).

Almost surely, 2^51118646 is an apocalyptic number.

51118646 is a deficient number, since it is larger than the sum of its proper divisors (25559326).

51118646 is a wasteful number, since it uses less digits than its factorization.

51118646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25559325.

The product of its digits is 5760, while the sum is 32.

The square root of 51118646 is about 7149.7304844309. The cubic root of 51118646 is about 371.1303296077.

The spelling of 51118646 in words is "fifty-one million, one hundred eighteen thousand, six hundred forty-six".