51461309 has 2 divisors, whose sum is σ = 51461310. Its totient is φ = 51461308.

The previous prime is 51461233. The next prime is 51461317. The reversal of 51461309 is 90316415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36638809 + 14822500 = 6053^2 + 3850^2 .

It is a cyclic number.

It is not a de Polignac number, because 51461309 - 2²⁴ = 34684093 is a prime.

It is equal to p_3083429 and since 51461309 and 3083429 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51461359) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25730654 + 25730655.

It is an arithmetic number, because the mean of its divisors is an integer number (25730655).

Almost surely, 2^51461309 is an apocalyptic number.

It is an amenable number.

51461309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51461309 is an equidigital number, since it uses as much as digits as its factorization.

51461309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 51461309 is about 7173.6538109948. The cubic root of 51461309 is about 371.9577480242.

The spelling of 51461309 in words is "fifty-one million, four hundred sixty-one thousand, three hundred nine".