71971667 has 2 divisors, whose sum is σ = 71971668. Its totient is φ = 71971666.

The previous prime is 71971657. The next prime is 71971673. The reversal of 71971667 is 76617917.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71971667 - 2⁴ = 71971651 is a prime.

It is not a weakly prime, because it can be changed into another prime (71971657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35985833 + 35985834.

It is an arithmetic number, because the mean of its divisors is an integer number (35985834).

Almost surely, 2^71971667 is an apocalyptic number.

71971667 is a deficient number, since it is larger than the sum of its proper divisors (1).

71971667 is an equidigital number, since it uses as much as digits as its factorization.

71971667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 44.

The square root of 71971667 is about 8483.6116719237. The cubic root of 71971667 is about 415.9621879926.

The spelling of 71971667 in words is "seventy-one million, nine hundred seventy-one thousand, six hundred sixty-seven".