231752921 has 2 divisors, whose sum is σ = 231752922. Its totient is φ = 231752920.

The previous prime is 231752863. The next prime is 231752947. The reversal of 231752921 is 129257132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201072400 + 30680521 = 14180^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 231752921 - 2²⁶ = 164644057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231752971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115876460 + 115876461.

It is an arithmetic number, because the mean of its divisors is an integer number (115876461).

Almost surely, 2^231752921 is an apocalyptic number.

It is an amenable number.

231752921 is a deficient number, since it is larger than the sum of its proper divisors (1).

231752921 is an equidigital number, since it uses as much as digits as its factorization.

231752921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 231752921 is about 15223.4332855634. The cubic root of 231752921 is about 614.2451540424.

The spelling of 231752921 in words is "two hundred thirty-one million, seven hundred fifty-two thousand, nine hundred twenty-one".