51276409 has 2 divisors, whose sum is σ = 51276410. Its totient is φ = 51276408.

The previous prime is 51276367. The next prime is 51276419. The reversal of 51276409 is 90467215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49843600 + 1432809 = 7060^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 51276409 - 2¹⁵ = 51243641 is a prime.

It is not a weakly prime, because it can be changed into another prime (51276419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25638204 + 25638205.

It is an arithmetic number, because the mean of its divisors is an integer number (25638205).

Almost surely, 2^51276409 is an apocalyptic number.

It is an amenable number.

51276409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51276409 is an equidigital number, since it uses as much as digits as its factorization.

51276409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 51276409 is about 7160.7547786529. The cubic root of 51276409 is about 371.5117331893.

The spelling of 51276409 in words is "fifty-one million, two hundred seventy-six thousand, four hundred nine".