51220345 has 16 divisors (see below), whose sum is σ = 67573440. Its totient is φ = 36961600.

The previous prime is 51220343. The next prime is 51220349. The reversal of 51220345 is 54302215.

It is not a de Polignac number, because 51220345 - 2¹ = 51220343 is a prime.

It is a super-3 number, since 3×51220345³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51220343) 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, 3651 + ... + 10759.

It is an arithmetic number, because the mean of its divisors is an integer number (4223340).

Almost surely, 2^51220345 is an apocalyptic number.

51220345 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51220345 is a deficient number, since it is larger than the sum of its proper divisors (16353095).

51220345 is a wasteful number, since it uses less digits than its factorization.

51220345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7256.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51220345 is about 7156.8390368933. The cubic root of 51220345 is about 371.3762840950.

The spelling of 51220345 in words is "fifty-one million, two hundred twenty thousand, three hundred forty-five".