71669513 has 2 divisors, whose sum is σ = 71669514. Its totient is φ = 71669512.

The previous prime is 71669461. The next prime is 71669567. The reversal of 71669513 is 31596617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70023424 + 1646089 = 8368^2 + 1283^2 .

It is a cyclic number.

It is not a de Polignac number, because 71669513 - 2¹⁶ = 71603977 is a prime.

It is not a weakly prime, because it can be changed into another prime (71669573) 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, 35834756 + 35834757.

It is an arithmetic number, because the mean of its divisors is an integer number (35834757).

Almost surely, 2^71669513 is an apocalyptic number.

It is an amenable number.

71669513 is a deficient number, since it is larger than the sum of its proper divisors (1).

71669513 is an equidigital number, since it uses as much as digits as its factorization.

71669513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 38.

The square root of 71669513 is about 8465.7848425294. The cubic root of 71669513 is about 415.3792690925.

The spelling of 71669513 in words is "seventy-one million, six hundred sixty-nine thousand, five hundred thirteen".