51220601 has 6 divisors (see below), whose sum is σ = 51616110. Its totient is φ = 50828096.

The previous prime is 51220577. The next prime is 51220621. The reversal of 51220601 is 10602215.

It can be written as a sum of positive squares in 3 ways, for example, as 25200400 + 26020201 = 5020^2 + 5101^2 .

It is not a de Polignac number, because 51220601 - 2⁶ = 51220537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51220601.

It is not an unprimeable number, because it can be changed into a prime (51220621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17405 + ... + 20133.

It is an arithmetic number, because the mean of its divisors is an integer number (8602685).

Almost surely, 2^51220601 is an apocalyptic number.

It is an amenable number.

51220601 is a deficient number, since it is larger than the sum of its proper divisors (395509).

51220601 is an equidigital number, since it uses as much as digits as its factorization.

51220601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003 (or 2866 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51220601 is about 7156.8569218617. The cubic root of 51220601 is about 371.3769028086.

Adding to 51220601 its reverse (10602215), we get a palindrome (61822816).

The spelling of 51220601 in words is "fifty-one million, two hundred twenty thousand, six hundred one".