5155561 has 2 divisors, whose sum is σ = 5155562. Its totient is φ = 5155560.

The previous prime is 5155547. The next prime is 5155567. The reversal of 5155561 is 1655515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5107600 + 47961 = 2260^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 5155561 - 2⁷ = 5155433 is a prime.

It is not a weakly prime, because it can be changed into another prime (5155567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2577780 + 2577781.

It is an arithmetic number, because the mean of its divisors is an integer number (2577781).

Almost surely, 2^5155561 is an apocalyptic number.

It is an amenable number.

5155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5155561 is an equidigital number, since it uses as much as digits as its factorization.

5155561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3750, while the sum is 28.

The square root of 5155561 is about 2270.5860476978. The cubic root of 5155561 is about 172.7528854069.

The spelling of 5155561 in words is "five million, one hundred fifty-five thousand, five hundred sixty-one".