51623215 has 32 divisors (see below), whose sum is σ = 74649600. Its totient is φ = 34221600.

The previous prime is 51623197. The next prime is 51623227. The reversal of 51623215 is 51232615.

It is not a de Polignac number, because 51623215 - 2¹⁵ = 51590447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51623215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52680 + ... + 53650.

It is an arithmetic number, because the mean of its divisors is an integer number (2332800).

Almost surely, 2^51623215 is an apocalyptic number.

51623215 is a deficient number, since it is larger than the sum of its proper divisors (23026385).

51623215 is an equidigital number, since it uses as much as digits as its factorization.

51623215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1014 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 51623215 is about 7184.9297143396. The cubic root of 51623215 is about 372.3474203565.

The spelling of 51623215 in words is "fifty-one million, six hundred twenty-three thousand, two hundred fifteen".