51693541 has 2 divisors, whose sum is σ = 51693542. Its totient is φ = 51693540.

The previous prime is 51693539. The next prime is 51693553. The reversal of 51693541 is 14539615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 9897316 = 6465^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 51693541 - 2¹ = 51693539 is a prime.

It is a super-2 number, since 2×51693541² = 5344444362237362, which contains 22 as substring.

Together with 51693539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51693497 and 51693506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51693511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25846770 + 25846771.

It is an arithmetic number, because the mean of its divisors is an integer number (25846771).

Almost surely, 2^51693541 is an apocalyptic number.

It is an amenable number.

51693541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51693541 is an equidigital number, since it uses as much as digits as its factorization.

51693541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 51693541 is about 7189.8220423040. The cubic root of 51693541 is about 372.5164258631.

The spelling of 51693541 in words is "fifty-one million, six hundred ninety-three thousand, five hundred forty-one".