231948131 has 2 divisors, whose sum is σ = 231948132. Its totient is φ = 231948130.

The previous prime is 231948127. The next prime is 231948133. The reversal of 231948131 is 131849132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231948131 - 2² = 231948127 is a prime.

It is a super-2 number, since 2×231948131² = 107599870948786322, which contains 22 as substring.

Together with 231948133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231948133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115974065 + 115974066.

It is an arithmetic number, because the mean of its divisors is an integer number (115974066).

Almost surely, 2^231948131 is an apocalyptic number.

231948131 is a deficient number, since it is larger than the sum of its proper divisors (1).

231948131 is an equidigital number, since it uses as much as digits as its factorization.

231948131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 231948131 is about 15229.8434332071. The cubic root of 231948131 is about 614.4175691949.

The spelling of 231948131 in words is "two hundred thirty-one million, nine hundred forty-eight thousand, one hundred thirty-one".