213977 has 2 divisors, whose sum is σ = 213978. Its totient is φ = 213976.

The previous prime is 213973. The next prime is 213989. The reversal of 213977 is 779312.

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., 175561 + 38416 = 419^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 213977 - 2² = 213973 is a prime.

It is not a weakly prime, because it can be changed into another prime (213973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106988 + 106989.

It is an arithmetic number, because the mean of its divisors is an integer number (106989).

2²¹³⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

213977 is a deficient number, since it is larger than the sum of its proper divisors (1).

213977 is an equidigital number, since it uses as much as digits as its factorization.

213977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 29.

The square root of 213977 is about 462.5764801630. The cubic root of 213977 is about 59.8120973427.

The spelling of 213977 in words is "two hundred thirteen thousand, nine hundred seventy-seven".