231948161 has 2 divisors, whose sum is σ = 231948162. Its totient is φ = 231948160.

The previous prime is 231948133. The next prime is 231948179. The reversal of 231948161 is 161849132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230098561 + 1849600 = 15169^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 231948161 - 2⁶ = 231948097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231948121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115974080 + 115974081.

It is an arithmetic number, because the mean of its divisors is an integer number (115974081).

Almost surely, 2^231948161 is an apocalyptic number.

It is an amenable number.

231948161 is a deficient number, since it is larger than the sum of its proper divisors (1).

231948161 is an equidigital number, since it uses as much as digits as its factorization.

231948161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 231948161 is about 15229.8444181154. The cubic root of 231948161 is about 614.4175956844.

The spelling of 231948161 in words is "two hundred thirty-one million, nine hundred forty-eight thousand, one hundred sixty-one".