71231663 has 2 divisors, whose sum is σ = 71231664. Its totient is φ = 71231662.

The previous prime is 71231639. The next prime is 71231669. The reversal of 71231663 is 36613217.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71231663 - 2²² = 67037359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71231669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35615831 + 35615832.

It is an arithmetic number, because the mean of its divisors is an integer number (35615832).

Almost surely, 2^71231663 is an apocalyptic number.

71231663 is a deficient number, since it is larger than the sum of its proper divisors (1).

71231663 is an equidigital number, since it uses as much as digits as its factorization.

71231663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 29.

The square root of 71231663 is about 8439.8852480351. The cubic root of 71231663 is about 414.5316495075.

The spelling of 71231663 in words is "seventy-one million, two hundred thirty-one thousand, six hundred sixty-three".