55690709 has 2 divisors, whose sum is σ = 55690710. Its totient is φ = 55690708.

The previous prime is 55690699. The next prime is 55690711. The reversal of 55690709 is 90709655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 485809 = 7430^2 + 697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55690709 is a prime.

Together with 55690711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55690769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845354 + 27845355.

It is an arithmetic number, because the mean of its divisors is an integer number (27845355).

Almost surely, 2^55690709 is an apocalyptic number.

It is an amenable number.

55690709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55690709 is an equidigital number, since it uses as much as digits as its factorization.

55690709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 55690709 is about 7462.6207862922. The cubic root of 55690709 is about 381.8805877502.

The spelling of 55690709 in words is "fifty-five million, six hundred ninety thousand, seven hundred nine".