213305977 has 2 divisors, whose sum is σ = 213305978. Its totient is φ = 213305976.

The previous prime is 213305969. The next prime is 213305993. The reversal of 213305977 is 779503312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210134016 + 3171961 = 14496^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 213305977 - 2³ = 213305969 is a prime.

It is equal to p_11773954 and since 213305977 and 11773954 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 (213305177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106652988 + 106652989.

It is an arithmetic number, because the mean of its divisors is an integer number (106652989).

Almost surely, 2^213305977 is an apocalyptic number.

It is an amenable number.

213305977 is a deficient number, since it is larger than the sum of its proper divisors (1).

213305977 is an equidigital number, since it uses as much as digits as its factorization.

213305977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 213305977 is about 14604.9983567271. The cubic root of 213305977 is about 597.4950911987.

The spelling of 213305977 in words is "two hundred thirteen million, three hundred five thousand, nine hundred seventy-seven".