51451409 has 2 divisors, whose sum is σ = 51451410. Its totient is φ = 51451408.

The previous prime is 51451369. The next prime is 51451427. The reversal of 51451409 is 90415415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 9784384 = 6455^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451409 - 2¹² = 51447313 is a prime.

It is not a weakly prime, because it can be changed into another prime (51451459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725704 + 25725705.

It is an arithmetic number, because the mean of its divisors is an integer number (25725705).

Almost surely, 2^51451409 is an apocalyptic number.

It is an amenable number.

51451409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451409 is an equidigital number, since it uses as much as digits as its factorization.

51451409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51451409 is about 7172.9637528709. The cubic root of 51451409 is about 371.9338943891.

The spelling of 51451409 in words is "fifty-one million, four hundred fifty-one thousand, four hundred nine".