71381409 has 12 divisors (see below), whose sum is σ = 104614608. Its totient is φ = 43261240.

The previous prime is 71381381. The next prime is 71381467. The reversal of 71381409 is 90418317.

It is not a de Polignac number, because 71381409 - 2⁵ = 71381377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 71381409.

It is not an unprimeable number, because it can be changed into a prime (71381509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97959 + ... + 98684.

It is an arithmetic number, because the mean of its divisors is an integer number (8717884).

Almost surely, 2^71381409 is an apocalyptic number.

It is an amenable number.

71381409 is a deficient number, since it is larger than the sum of its proper divisors (33233199).

71381409 is a wasteful number, since it uses less digits than its factorization.

71381409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196668 (or 196657 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 71381409 is about 8448.7519196625. The cubic root of 71381409 is about 414.8219277632.

The spelling of 71381409 in words is "seventy-one million, three hundred eighty-one thousand, four hundred nine".