71449621 has 4 divisors (see below), whose sum is σ = 71491392. Its totient is φ = 71407852.

The previous prime is 71449613. The next prime is 71449639. The reversal of 71449621 is 12694417.

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: 12694417 = 43 ⋅295219.

It is a cyclic number.

It is not a de Polignac number, because 71449621 - 2³ = 71449613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71449121) 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, 18205 + ... + 21778.

It is an arithmetic number, because the mean of its divisors is an integer number (17872848).

Almost surely, 2^71449621 is an apocalyptic number.

It is an amenable number.

71449621 is a deficient number, since it is larger than the sum of its proper divisors (41771).

71449621 is a wasteful number, since it uses less digits than its factorization.

71449621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41770.

The product of its digits is 12096, while the sum is 34.

The square root of 71449621 is about 8452.7877649921. The cubic root of 71449621 is about 414.9540201635.

The spelling of 71449621 in words is "seventy-one million, four hundred forty-nine thousand, six hundred twenty-one".