71161409 has 4 divisors (see below), whose sum is σ = 77630640. Its totient is φ = 64692180.

The previous prime is 71161381. The next prime is 71161429. The reversal of 71161409 is 90416117.

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.

It is a cyclic number.

It is not a de Polignac number, because 71161409 - 2¹² = 71157313 is a prime.

It is a super-2 number, since 2×71161409² = 10127892261730562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71161429) 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 in 3 ways as a sum of consecutive naturals, for example, 3234599 + ... + 3234620.

It is an arithmetic number, because the mean of its divisors is an integer number (19407660).

Almost surely, 2^71161409 is an apocalyptic number.

It is an amenable number.

71161409 is a deficient number, since it is larger than the sum of its proper divisors (6469231).

71161409 is a wasteful number, since it uses less digits than its factorization.

71161409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469230.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 71161409 is about 8435.7221978915. The cubic root of 71161409 is about 414.3953239616.

The spelling of 71161409 in words is "seventy-one million, one hundred sixty-one thousand, four hundred nine".