71225989 has 2 divisors, whose sum is σ = 71225990. Its totient is φ = 71225988.

The previous prime is 71225953. The next prime is 71226007. The reversal of 71225989 is 98952217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 917764 = 8385^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 71225989 - 2⁹ = 71225477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71225929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35612994 + 35612995.

It is an arithmetic number, because the mean of its divisors is an integer number (35612995).

Almost surely, 2^71225989 is an apocalyptic number.

It is an amenable number.

71225989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71225989 is an equidigital number, since it uses as much as digits as its factorization.

71225989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 43.

The square root of 71225989 is about 8439.5490993299. The cubic root of 71225989 is about 414.5206426278.

The spelling of 71225989 in words is "seventy-one million, two hundred twenty-five thousand, nine hundred eighty-nine".