71889091 has 2 divisors, whose sum is σ = 71889092. Its totient is φ = 71889090.

The previous prime is 71889079. The next prime is 71889101. The reversal of 71889091 is 19098817.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71889091 - 2¹⁷ = 71758019 is a prime.

It is not a weakly prime, because it can be changed into another prime (71889011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35944545 + 35944546.

It is an arithmetic number, because the mean of its divisors is an integer number (35944546).

Almost surely, 2^71889091 is an apocalyptic number.

71889091 is a deficient number, since it is larger than the sum of its proper divisors (1).

71889091 is an equidigital number, since it uses as much as digits as its factorization.

71889091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 71889091 is about 8478.7434800211. The cubic root of 71889091 is about 415.8030437074.

The spelling of 71889091 in words is "seventy-one million, eight hundred eighty-nine thousand, ninety-one".