71121049 has 2 divisors, whose sum is σ = 71121050. Its totient is φ = 71121048.

The previous prime is 71121031. The next prime is 71121077. The reversal of 71121049 is 94012117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50509449 + 20611600 = 7107^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 71121049 - 2⁷ = 71120921 is a prime.

It is a super-2 number, since 2×71121049² = 10116407221720802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71128049) 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, 35560524 + 35560525.

It is an arithmetic number, because the mean of its divisors is an integer number (35560525).

Almost surely, 2^71121049 is an apocalyptic number.

It is an amenable number.

71121049 is a deficient number, since it is larger than the sum of its proper divisors (1).

71121049 is an equidigital number, since it uses as much as digits as its factorization.

71121049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 71121049 is about 8433.3296508556. The cubic root of 71121049 is about 414.3169661437.

The spelling of 71121049 in words is "seventy-one million, one hundred twenty-one thousand, forty-nine".