51411209 has 2 divisors, whose sum is σ = 51411210. Its totient is φ = 51411208.

The previous prime is 51411119. The next prime is 51411211. The reversal of 51411209 is 90211415.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 73984 = 7165^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 51411209 - 2²⁴ = 34633993 is a prime.

It is a super-2 number, since 2×51411209² = 5286224821683362, which contains 22 as substring.

Together with 51411211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51411289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25705604 + 25705605.

It is an arithmetic number, because the mean of its divisors is an integer number (25705605).

Almost surely, 2^51411209 is an apocalyptic number.

It is an amenable number.

51411209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51411209 is an equidigital number, since it uses as much as digits as its factorization.

51411209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 51411209 is about 7170.1610163231. The cubic root of 51411209 is about 371.8370027227.

The spelling of 51411209 in words is "fifty-one million, four hundred eleven thousand, two hundred nine".