51220641 has 8 divisors (see below), whose sum is σ = 70649280. Its totient is φ = 32969552.

The previous prime is 51220639. The next prime is 51220703. The reversal of 51220641 is 14602215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51220641 - 2¹ = 51220639 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 294285 + ... + 294458.

It is an arithmetic number, because the mean of its divisors is an integer number (8831160).

Almost surely, 2^51220641 is an apocalyptic number.

It is an amenable number.

51220641 is a deficient number, since it is larger than the sum of its proper divisors (19428639).

51220641 is a wasteful number, since it uses less digits than its factorization.

51220641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588775.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51220641 is about 7156.8597163840. The cubic root of 51220641 is about 371.3769994824.

Adding to 51220641 its reverse (14602215), we get a palindrome (65822856).

The spelling of 51220641 in words is "fifty-one million, two hundred twenty thousand, six hundred forty-one".