71009669 has 4 divisors (see below), whose sum is σ = 74747040. Its totient is φ = 67272300.

The previous prime is 71009651. The next prime is 71009677. The reversal of 71009669 is 96690017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96690017 = 2143 ⋅45119.

It is a cyclic number.

It is not a de Polignac number, because 71009669 - 2⁸ = 71009413 is a prime.

It is a super-2 number, since 2×71009669² = 10084746182979122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71009689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868657 + ... + 1868694.

It is an arithmetic number, because the mean of its divisors is an integer number (18686760).

Almost surely, 2^71009669 is an apocalyptic number.

It is an amenable number.

71009669 is a deficient number, since it is larger than the sum of its proper divisors (3737371).

71009669 is a wasteful number, since it uses less digits than its factorization.

71009669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737370.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 71009669 is about 8426.7235032366. The cubic root of 71009669 is about 414.1005710688.

The spelling of 71009669 in words is "seventy-one million, nine thousand, six hundred sixty-nine".