71190989 has 2 divisors, whose sum is σ = 71190990. Its totient is φ = 71190988.

The previous prime is 71190971. The next prime is 71190991. The reversal of 71190989 is 98909117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 30614089 = 6370^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 71190989 - 2¹² = 71186893 is a prime.

It is a Sophie Germain prime.

Together with 71190991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71190689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35595494 + 35595495.

It is an arithmetic number, because the mean of its divisors is an integer number (35595495).

Almost surely, 2^71190989 is an apocalyptic number.

It is an amenable number.

71190989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71190989 is an equidigital number, since it uses as much as digits as its factorization.

71190989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 71190989 is about 8437.4752740378. The cubic root of 71190989 is about 414.4527338969.

The spelling of 71190989 in words is "seventy-one million, one hundred ninety thousand, nine hundred eighty-nine".