51380513 has 2 divisors, whose sum is σ = 51380514. Its totient is φ = 51380512.

The previous prime is 51380471. The next prime is 51380543. The reversal of 51380513 is 31508315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51380224 + 289 = 7168^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 51380513 - 2⁶ = 51380449 is a prime.

It is a super-2 number, since 2×51380513² = 5279914232286338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51380543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690256 + 25690257.

It is an arithmetic number, because the mean of its divisors is an integer number (25690257).

Almost surely, 2^51380513 is an apocalyptic number.

It is an amenable number.

51380513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51380513 is an equidigital number, since it uses as much as digits as its factorization.

51380513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51380513 is about 7168.0201590118. The cubic root of 51380513 is about 371.7629839679.

Adding to 51380513 its reverse (31508315), we get a palindrome (82888828).

The spelling of 51380513 in words is "fifty-one million, three hundred eighty thousand, five hundred thirteen".