51351409 has 2 divisors, whose sum is σ = 51351410. Its totient is φ = 51351408.

The previous prime is 51351397. The next prime is 51351437. The reversal of 51351409 is 90415315.

It is an a-pointer prime, because the next prime (51351437) can be obtained adding 51351409 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 23736384 = 5255^2 + 4872^2 .

It is a cyclic number.

It is not a de Polignac number, because 51351409 - 2¹³ = 51343217 is a prime.

It is not a weakly prime, because it can be changed into another prime (51351439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675704 + 25675705.

It is an arithmetic number, because the mean of its divisors is an integer number (25675705).

Almost surely, 2^51351409 is an apocalyptic number.

It is an amenable number.

51351409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51351409 is an equidigital number, since it uses as much as digits as its factorization.

51351409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51351409 is about 7165.9897432246. The cubic root of 51351409 is about 371.6927768484.

The spelling of 51351409 in words is "fifty-one million, three hundred fifty-one thousand, four hundred nine".