213455777 has 2 divisors, whose sum is σ = 213455778. Its totient is φ = 213455776.

The previous prime is 213455773. The next prime is 213455789. The reversal of 213455777 is 777554312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165997456 + 47458321 = 12884^2 + 6889^2 .

It is a cyclic number.

It is not a de Polignac number, because 213455777 - 2² = 213455773 is a prime.

It is a Chen prime.

It is equal to p_11781779 and since 213455777 and 11781779 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (213455773) 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, 106727888 + 106727889.

It is an arithmetic number, because the mean of its divisors is an integer number (106727889).

Almost surely, 2^213455777 is an apocalyptic number.

It is an amenable number.

213455777 is a deficient number, since it is larger than the sum of its proper divisors (1).

213455777 is an equidigital number, since it uses as much as digits as its factorization.

213455777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205800, while the sum is 41.

The square root of 213455777 is about 14610.1258379249. The cubic root of 213455777 is about 597.6349275998.

The spelling of 213455777 in words is "two hundred thirteen million, four hundred fifty-five thousand, seven hundred seventy-seven".