51380261 has 4 divisors (see below), whose sum is σ = 51417792. Its totient is φ = 51342732.

The previous prime is 51380249. The next prime is 51380269. The reversal of 51380261 is 16208315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51380261 - 2¹⁴ = 51363877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51380261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51380269) 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, 16631 + ... + 19476.

It is an arithmetic number, because the mean of its divisors is an integer number (12854448).

Almost surely, 2^51380261 is an apocalyptic number.

It is an amenable number.

51380261 is a deficient number, since it is larger than the sum of its proper divisors (37531).

51380261 is a wasteful number, since it uses less digits than its factorization.

51380261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37530.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51380261 is about 7168.0025809147. The cubic root of 51380261 is about 371.7623761861.

Adding to 51380261 its reverse (16208315), we get a palindrome (67588576).

The spelling of 51380261 in words is "fifty-one million, three hundred eighty thousand, two hundred sixty-one".