51946165 has 4 divisors (see below), whose sum is σ = 62335404. Its totient is φ = 41556928.

The previous prime is 51946129. The next prime is 51946183. The reversal of 51946165 is 56164915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56164915 = 5 ⋅11232983.

It can be written as a sum of positive squares in 2 ways, for example, as 37246609 + 14699556 = 6103^2 + 3834^2 .

It is a cyclic number.

It is not a de Polignac number, because 51946165 - 2⁹ = 51945653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5194612 + ... + 5194621.

It is an arithmetic number, because the mean of its divisors is an integer number (15583851).

Almost surely, 2^51946165 is an apocalyptic number.

It is an amenable number.

51946165 is a deficient number, since it is larger than the sum of its proper divisors (10389239).

51946165 is a wasteful number, since it uses less digits than its factorization.

51946165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389238.

The product of its digits is 32400, while the sum is 37.

The square root of 51946165 is about 7207.3687986671. The cubic root of 51946165 is about 373.1222636807.

The spelling of 51946165 in words is "fifty-one million, nine hundred forty-six thousand, one hundred sixty-five".