51413261 has 4 divisors (see below), whose sum is σ = 51740892. Its totient is φ = 51085632.

The previous prime is 51413227. The next prime is 51413269. The reversal of 51413261 is 16231415.

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 38316100 + 13097161 = 6190^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 51413261 - 2¹⁸ = 51151117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51413269) 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, 163580 + ... + 163893.

It is an arithmetic number, because the mean of its divisors is an integer number (12935223).

Almost surely, 2^51413261 is an apocalyptic number.

It is an amenable number.

51413261 is a deficient number, since it is larger than the sum of its proper divisors (327631).

51413261 is a wasteful number, since it uses less digits than its factorization.

51413261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327630.

The product of its digits is 720, while the sum is 23.

The square root of 51413261 is about 7170.3041079162. The cubic root of 51413261 is about 371.8419497591.

Adding to 51413261 its reverse (16231415), we get a palindrome (67644676).

The spelling of 51413261 in words is "fifty-one million, four hundred thirteen thousand, two hundred sixty-one".