231871447 has 2 divisors, whose sum is σ = 231871448. Its totient is φ = 231871446.

The previous prime is 231871427. The next prime is 231871463. The reversal of 231871447 is 744178132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231871447 - 2¹¹ = 231869399 is a prime.

It is equal to p_12739834 and since 231871447 and 12739834 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231871427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115935723 + 115935724.

It is an arithmetic number, because the mean of its divisors is an integer number (115935724).

Almost surely, 2^231871447 is an apocalyptic number.

231871447 is a deficient number, since it is larger than the sum of its proper divisors (1).

231871447 is an equidigital number, since it uses as much as digits as its factorization.

231871447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 37.

The square root of 231871447 is about 15227.3256680219. The cubic root of 231871447 is about 614.3498511956.

The spelling of 231871447 in words is "two hundred thirty-one million, eight hundred seventy-one thousand, four hundred forty-seven".