51696109 has 2 divisors, whose sum is σ = 51696110. Its totient is φ = 51696108.

The previous prime is 51696103. The next prime is 51696119. The reversal of 51696109 is 90169615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 9 = 7190^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 51696109 - 2³ = 51696101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51696101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25848054 + 25848055.

It is an arithmetic number, because the mean of its divisors is an integer number (25848055).

Almost surely, 2^51696109 is an apocalyptic number.

It is an amenable number.

51696109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51696109 is an equidigital number, since it uses as much as digits as its factorization.

51696109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 51696109 is about 7190.0006258692. Note that the first 3 decimals coincide. The cubic root of 51696109 is about 372.5225943084.

The spelling of 51696109 in words is "fifty-one million, six hundred ninety-six thousand, one hundred nine".