55207709 has 2 divisors, whose sum is σ = 55207710. Its totient is φ = 55207708.

The previous prime is 55207697. The next prime is 55207727. The reversal of 55207709 is 90770255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 2809 = 7430^2 + 53^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55207709 is a prime.

It is a super-2 number, since 2×55207709² = 6095782266057362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55207729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27603854 + 27603855.

It is an arithmetic number, because the mean of its divisors is an integer number (27603855).

Almost surely, 2^55207709 is an apocalyptic number.

It is an amenable number.

55207709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55207709 is an equidigital number, since it uses as much as digits as its factorization.

55207709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 55207709 is about 7430.1890285510. The cubic root of 55207709 is about 380.7733764790.

The spelling of 55207709 in words is "fifty-five million, two hundred seven thousand, seven hundred nine".