55821089 has 2 divisors, whose sum is σ = 55821090. Its totient is φ = 55821088.

The previous prime is 55821043. The next prime is 55821097. The reversal of 55821089 is 98012855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55726225 + 94864 = 7465^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 55821089 - 2¹² = 55816993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55841089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27910544 + 27910545.

It is an arithmetic number, because the mean of its divisors is an integer number (27910545).

Almost surely, 2^55821089 is an apocalyptic number.

It is an amenable number.

55821089 is a deficient number, since it is larger than the sum of its proper divisors (1).

55821089 is an equidigital number, since it uses as much as digits as its factorization.

55821089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 55821089 is about 7471.3512164802. The cubic root of 55821089 is about 382.1783680412.

The spelling of 55821089 in words is "fifty-five million, eight hundred twenty-one thousand, eighty-nine".