55513309 has 2 divisors, whose sum is σ = 55513310. Its totient is φ = 55513308.

The previous prime is 55513291. The next prime is 55513321. The reversal of 55513309 is 90331555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52969284 + 2544025 = 7278^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 55513309 - 2⁷ = 55513181 is a prime.

It is a super-2 number, since 2×55513309² = 6163454952258962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55513349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27756654 + 27756655.

It is an arithmetic number, because the mean of its divisors is an integer number (27756655).

Almost surely, 2^55513309 is an apocalyptic number.

It is an amenable number.

55513309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55513309 is an equidigital number, since it uses as much as digits as its factorization.

55513309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10125, while the sum is 31.

The square root of 55513309 is about 7450.7254009257. The cubic root of 55513309 is about 381.4746691898.

The spelling of 55513309 in words is "fifty-five million, five hundred thirteen thousand, three hundred nine".