55691737 has 2 divisors, whose sum is σ = 55691738. Its totient is φ = 55691736.

The previous prime is 55691729. The next prime is 55691747. The reversal of 55691737 is 73719655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 7096896 = 6971^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 55691737 - 2³ = 55691729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55691693 and 55691702.

It is not a weakly prime, because it can be changed into another prime (55691707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845868 + 27845869.

It is an arithmetic number, because the mean of its divisors is an integer number (27845869).

Almost surely, 2^55691737 is an apocalyptic number.

It is an amenable number.

55691737 is a deficient number, since it is larger than the sum of its proper divisors (1).

55691737 is an equidigital number, since it uses as much as digits as its factorization.

55691737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 43.

The square root of 55691737 is about 7462.6896625814. The cubic root of 55691737 is about 381.8829374588.

The spelling of 55691737 in words is "fifty-five million, six hundred ninety-one thousand, seven hundred thirty-seven".