51023217 has 16 divisors (see below), whose sum is σ = 78158720. Its totient is φ = 29002752.

The previous prime is 51023207. The next prime is 51023221. The reversal of 51023217 is 71232015.

It is not a de Polignac number, because 51023217 - 2⁴ = 51023201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51023193 and 51023202.

It is not an unprimeable number, because it can be changed into a prime (51023207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2242 + ... + 10347.

It is an arithmetic number, because the mean of its divisors is an integer number (4884920).

Almost surely, 2^51023217 is an apocalyptic number.

It is an amenable number.

51023217 is a deficient number, since it is larger than the sum of its proper divisors (27135503).

51023217 is a wasteful number, since it uses less digits than its factorization.

51023217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12792.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51023217 is about 7143.0537587225. The cubic root of 51023217 is about 370.8992419934.

The spelling of 51023217 in words is "fifty-one million, twenty-three thousand, two hundred seventeen".