213437250161 has 2 divisors, whose sum is σ = 213437250162. Its totient is φ = 213437250160.

The previous prime is 213437250127. The next prime is 213437250223. The reversal of 213437250161 is 161052734312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198688605025 + 14748645136 = 445745^2 + 121444^2 .

It is a cyclic number.

It is not a de Polignac number, because 213437250161 - 2²⁶ = 213370141297 is a prime.

It is not a weakly prime, because it can be changed into another prime (213437750161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106718625080 + 106718625081.

It is an arithmetic number, because the mean of its divisors is an integer number (106718625081).

Almost surely, 2^213437250161 is an apocalyptic number.

It is an amenable number.

213437250161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213437250161 is an equidigital number, since it uses as much as digits as its factorization.

213437250161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 213437250161 its reverse (161052734312), we get a palindrome (374489984473).

The spelling of 213437250161 in words is "two hundred thirteen billion, four hundred thirty-seven million, two hundred fifty thousand, one hundred sixty-one".