71993481 has 32 divisors (see below), whose sum is σ = 114183168. Its totient is φ = 39493440.

The previous prime is 71993479. The next prime is 71993491. The reversal of 71993481 is 18439917.

It is a happy number.

It is not a de Polignac number, because 71993481 - 2¹ = 71993479 is a prime.

It is a super-2 number, since 2×71993481² = 10366122612994722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71993491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54430 + ... + 55736.

It is an arithmetic number, because the mean of its divisors is an integer number (3568224).

Almost surely, 2^71993481 is an apocalyptic number.

It is an amenable number.

71993481 is a deficient number, since it is larger than the sum of its proper divisors (42189687).

71993481 is a wasteful number, since it uses less digits than its factorization.

71993481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 54432, while the sum is 42.

The square root of 71993481 is about 8484.8972297842. The cubic root of 71993481 is about 416.0042086143.

The spelling of 71993481 in words is "seventy-one million, nine hundred ninety-three thousand, four hundred eighty-one".