71723569 has 2 divisors, whose sum is σ = 71723570. Its totient is φ = 71723568.

The previous prime is 71723557. The next prime is 71723573. The reversal of 71723569 is 96532717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 4892944 = 8175^2 + 2212^2 .

It is a cyclic number.

It is not a de Polignac number, because 71723569 - 2¹³ = 71715377 is a prime.

It is a super-2 number, since 2×71723569² = 10288540700195522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71723539) 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, 35861784 + 35861785.

It is an arithmetic number, because the mean of its divisors is an integer number (35861785).

Almost surely, 2^71723569 is an apocalyptic number.

It is an amenable number.

71723569 is a deficient number, since it is larger than the sum of its proper divisors (1).

71723569 is an equidigital number, since it uses as much as digits as its factorization.

71723569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 71723569 is about 8468.9768567401. The cubic root of 71723569 is about 415.4836747085.

The spelling of 71723569 in words is "seventy-one million, seven hundred twenty-three thousand, five hundred sixty-nine".