51261323 has 4 divisors (see below), whose sum is σ = 51301968. Its totient is φ = 51220680.

The previous prime is 51261313. The next prime is 51261359. The reversal of 51261323 is 32316215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32316215 = 5 ⋅6463243.

It is a cyclic number.

It is not a de Polignac number, because 51261323 - 2¹⁰ = 51260299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51261313) 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, 18368 + ... + 20973.

It is an arithmetic number, because the mean of its divisors is an integer number (12825492).

Almost surely, 2^51261323 is an apocalyptic number.

51261323 is a deficient number, since it is larger than the sum of its proper divisors (40645).

51261323 is a wasteful number, since it uses less digits than its factorization.

51261323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40644.

The product of its digits is 1080, while the sum is 23.

The square root of 51261323 is about 7159.7013205859. The cubic root of 51261323 is about 371.4752955380.

Adding to 51261323 its reverse (32316215), we get a palindrome (83577538).

The spelling of 51261323 in words is "fifty-one million, two hundred sixty-one thousand, three hundred twenty-three".