55877321 has 2 divisors, whose sum is σ = 55877322. Its totient is φ = 55877320.

The previous prime is 55877303. The next prime is 55877387. The reversal of 55877321 is 12377855.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 2016400 = 7339^2 + 1420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55877321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55877621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27938660 + 27938661.

It is an arithmetic number, because the mean of its divisors is an integer number (27938661).

Almost surely, 2^55877321 is an apocalyptic number.

It is an amenable number.

55877321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55877321 is an equidigital number, since it uses as much as digits as its factorization.

55877321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 38.

The square root of 55877321 is about 7475.1134439552. The cubic root of 55877321 is about 382.3066555286.

The spelling of 55877321 in words is "fifty-five million, eight hundred seventy-seven thousand, three hundred twenty-one".