213430817 has 2 divisors, whose sum is σ = 213430818. Its totient is φ = 213430816.

The previous prime is 213430771. The next prime is 213430859. The reversal of 213430817 is 718034312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212255761 + 1175056 = 14569^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 213430817 - 2²² = 209236513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213430817.

It is not a weakly prime, because it can be changed into another prime (213430717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106715408 + 106715409.

It is an arithmetic number, because the mean of its divisors is an integer number (106715409).

Almost surely, 2^213430817 is an apocalyptic number.

It is an amenable number.

213430817 is a deficient number, since it is larger than the sum of its proper divisors (1).

213430817 is an equidigital number, since it uses as much as digits as its factorization.

213430817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 213430817 is about 14609.2716108641. The cubic root of 213430817 is about 597.6116322995.

The spelling of 213430817 in words is "two hundred thirteen million, four hundred thirty thousand, eight hundred seventeen".