71851449 has 4 divisors (see below), whose sum is σ = 95801936. Its totient is φ = 47900964.

The previous prime is 71851441. The next prime is 71851453. The reversal of 71851449 is 94415817.

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: 94415817 = 3 ⋅31471939.

It is not a de Polignac number, because 71851449 - 2³ = 71851441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71851441) 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, 11975239 + ... + 11975244.

It is an arithmetic number, because the mean of its divisors is an integer number (23950484).

Almost surely, 2^71851449 is an apocalyptic number.

It is an amenable number.

71851449 is a deficient number, since it is larger than the sum of its proper divisors (23950487).

71851449 is a wasteful number, since it uses less digits than its factorization.

71851449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23950486.

The product of its digits is 40320, while the sum is 39.

The square root of 71851449 is about 8476.5234029052. The cubic root of 71851449 is about 415.7304578647.

The spelling of 71851449 in words is "seventy-one million, eight hundred fifty-one thousand, four hundred forty-nine".