51224401 has 4 divisors (see below), whose sum is σ = 51253092. Its totient is φ = 51195712.

The previous prime is 51224389. The next prime is 51224429. The reversal of 51224401 is 10442215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 25010001 = 5120^2 + 5001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51224401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51224461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11476 + ... + 15301.

It is an arithmetic number, because the mean of its divisors is an integer number (12813273).

Almost surely, 2^51224401 is an apocalyptic number.

51224401 is the 3826-th nonagonal number.

It is an amenable number.

51224401 is a deficient number, since it is larger than the sum of its proper divisors (28691).

51224401 is a wasteful number, since it uses less digits than its factorization.

51224401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28690.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 51224401 is about 7157.1223966061. The cubic root of 51224401 is about 371.3860865960.

Adding to 51224401 its reverse (10442215), we get a palindrome (61666616).

The spelling of 51224401 in words is "fifty-one million, two hundred twenty-four thousand, four hundred one".