71449631 has 4 divisors (see below), whose sum is σ = 77945064. Its totient is φ = 64954200.

The previous prime is 71449613. The next prime is 71449639. The reversal of 71449631 is 13694417.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71449631 - 2²² = 67255327 is a prime.

It is a super-2 number, since 2×71449631² = 10210099540072322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71449591 and 71449600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71449639) 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, 3247700 + ... + 3247721.

It is an arithmetic number, because the mean of its divisors is an integer number (19486266).

Almost surely, 2^71449631 is an apocalyptic number.

71449631 is a deficient number, since it is larger than the sum of its proper divisors (6495433).

71449631 is a wasteful number, since it uses less digits than its factorization.

71449631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495432.

The product of its digits is 18144, while the sum is 35.

The square root of 71449631 is about 8452.7883565129. The cubic root of 71449631 is about 414.9540395223.

The spelling of 71449631 in words is "seventy-one million, four hundred forty-nine thousand, six hundred thirty-one".