51623365 has 4 divisors (see below), whose sum is σ = 61948044. Its totient is φ = 41298688.

The previous prime is 51623357. The next prime is 51623371. The reversal of 51623365 is 56332615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56332615 = 5 ⋅11266523.

It can be written as a sum of positive squares in 2 ways, for example, as 31561924 + 20061441 = 5618^2 + 4479^2 .

It is a cyclic number.

It is not a de Polignac number, because 51623365 - 2³ = 51623357 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5162332 + ... + 5162341.

It is an arithmetic number, because the mean of its divisors is an integer number (15487011).

Almost surely, 2^51623365 is an apocalyptic number.

It is an amenable number.

51623365 is a deficient number, since it is larger than the sum of its proper divisors (10324679).

51623365 is a wasteful number, since it uses less digits than its factorization.

51623365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324678.

The product of its digits is 16200, while the sum is 31.

The square root of 51623365 is about 7184.9401528475. The cubic root of 51623365 is about 372.3477809957.

The spelling of 51623365 in words is "fifty-one million, six hundred twenty-three thousand, three hundred sixty-five".