51383261 has 4 divisors (see below), whose sum is σ = 51426300. Its totient is φ = 51340224.

The previous prime is 51383251. The next prime is 51383263. The reversal of 51383261 is 16238315.

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 37283236 + 14100025 = 6106^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 51383261 - 2¹⁰ = 51382237 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 (51383263) 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, 19676 + ... + 22133.

It is an arithmetic number, because the mean of its divisors is an integer number (12856575).

Almost surely, 2^51383261 is an apocalyptic number.

It is an amenable number.

51383261 is a deficient number, since it is larger than the sum of its proper divisors (43039).

51383261 is a wasteful number, since it uses less digits than its factorization.

51383261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43038.

The product of its digits is 4320, while the sum is 29.

The square root of 51383261 is about 7168.2118411777. The cubic root of 51383261 is about 371.7696115549.

The spelling of 51383261 in words is "fifty-one million, three hundred eighty-three thousand, two hundred sixty-one".