71617249 has 4 divisors (see below), whose sum is σ = 78127920. Its totient is φ = 65106580.

The previous prime is 71617241. The next prime is 71617261. The reversal of 71617249 is 94271617.

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 not a de Polignac number, because 71617249 - 2³ = 71617241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71617241) 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 in 3 ways as a sum of consecutive naturals, for example, 3255319 + ... + 3255340.

It is an arithmetic number, because the mean of its divisors is an integer number (19531980).

Almost surely, 2^71617249 is an apocalyptic number.

It is an amenable number.

71617249 is a deficient number, since it is larger than the sum of its proper divisors (6510671).

71617249 is a wasteful number, since it uses less digits than its factorization.

71617249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510670.

The product of its digits is 21168, while the sum is 37.

The square root of 71617249 is about 8462.6975013881. The cubic root of 71617249 is about 415.2782746787.

The spelling of 71617249 in words is "seventy-one million, six hundred seventeen thousand, two hundred forty-nine".