71541989 has 2 divisors, whose sum is σ = 71541990. Its totient is φ = 71541988.

The previous prime is 71541961. The next prime is 71542063. The reversal of 71541989 is 98914517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 4225 = 8458^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 71541989 - 2⁸ = 71541733 is a prime.

It is a super-2 number, since 2×71541989² = 10236512380152242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71544989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35770994 + 35770995.

It is an arithmetic number, because the mean of its divisors is an integer number (35770995).

Almost surely, 2^71541989 is an apocalyptic number.

It is an amenable number.

71541989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71541989 is an equidigital number, since it uses as much as digits as its factorization.

71541989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 71541989 is about 8458.2497598498. The cubic root of 71541989 is about 415.1327566756.

The spelling of 71541989 in words is "seventy-one million, five hundred forty-one thousand, nine hundred eighty-nine".