55810889 has 2 divisors, whose sum is σ = 55810890. Its totient is φ = 55810888.

The previous prime is 55810841. The next prime is 55810919. The reversal of 55810889 is 98801855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 12145225 = 6608^2 + 3485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55810889 is a prime.

It is a super-2 number, since 2×55810889² = 6229710661940642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55810829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27905444 + 27905445.

It is an arithmetic number, because the mean of its divisors is an integer number (27905445).

Almost surely, 2^55810889 is an apocalyptic number.

It is an amenable number.

55810889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55810889 is an equidigital number, since it uses as much as digits as its factorization.

55810889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 55810889 is about 7470.6685778450. The cubic root of 55810889 is about 382.1550885670.

The spelling of 55810889 in words is "fifty-five million, eight hundred ten thousand, eight hundred eighty-nine".