71542091 has 2 divisors, whose sum is σ = 71542092. Its totient is φ = 71542090.

The previous prime is 71542073. The next prime is 71542111. The reversal of 71542091 is 19024517.

It is a weak prime.

It is an emirp because it is prime and its reverse (19024517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71542091 - 2¹⁸ = 71279947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71545091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35771045 + 35771046.

It is an arithmetic number, because the mean of its divisors is an integer number (35771046).

Almost surely, 2^71542091 is an apocalyptic number.

71542091 is a deficient number, since it is larger than the sum of its proper divisors (1).

71542091 is an equidigital number, since it uses as much as digits as its factorization.

71542091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 71542091 is about 8458.2557894639. The cubic root of 71542091 is about 415.1329539654.

The spelling of 71542091 in words is "seventy-one million, five hundred forty-two thousand, ninety-one".