71436991 has 2 divisors, whose sum is σ = 71436992. Its totient is φ = 71436990.

The previous prime is 71436983. The next prime is 71437013. The reversal of 71436991 is 19963417.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71436991 - 2³ = 71436983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71436971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35718495 + 35718496.

It is an arithmetic number, because the mean of its divisors is an integer number (35718496).

Almost surely, 2^71436991 is an apocalyptic number.

71436991 is a deficient number, since it is larger than the sum of its proper divisors (1).

71436991 is an equidigital number, since it uses as much as digits as its factorization.

71436991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 71436991 is about 8452.0406411706. The cubic root of 71436991 is about 414.9295685381.

It can be divided in two parts, 71436 and 991, that added together give a palindrome (72427).

The spelling of 71436991 in words is "seventy-one million, four hundred thirty-six thousand, nine hundred ninety-one".