71232391 has 2 divisors, whose sum is σ = 71232392. Its totient is φ = 71232390.

The previous prime is 71232379. The next prime is 71232409. The reversal of 71232391 is 19323217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71232391 - 2⁹ = 71231879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71232331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35616195 + 35616196.

It is an arithmetic number, because the mean of its divisors is an integer number (35616196).

Almost surely, 2^71232391 is an apocalyptic number.

71232391 is a deficient number, since it is larger than the sum of its proper divisors (1).

71232391 is an equidigital number, since it uses as much as digits as its factorization.

71232391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

The square root of 71232391 is about 8439.9283764733. The cubic root of 71232391 is about 414.5330616979.

The spelling of 71232391 in words is "seventy-one million, two hundred thirty-two thousand, three hundred ninety-one".