71959681 has 4 divisors (see below), whose sum is σ = 72276912. Its totient is φ = 71642452.

The previous prime is 71959619. The next prime is 71959717. The reversal of 71959681 is 18695917.

It is a happy number.

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: 18695917 = 139 ⋅134503.

It is a cyclic number.

It is not a de Polignac number, because 71959681 - 2⁷ = 71959553 is a prime.

It is a super-2 number, since 2×71959681² = 10356391379243522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71959981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158275 + ... + 158728.

It is an arithmetic number, because the mean of its divisors is an integer number (18069228).

Almost surely, 2^71959681 is an apocalyptic number.

It is an amenable number.

71959681 is a deficient number, since it is larger than the sum of its proper divisors (317231).

71959681 is a wasteful number, since it uses less digits than its factorization.

71959681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317230.

The product of its digits is 136080, while the sum is 46.

The square root of 71959681 is about 8482.9052216797. The cubic root of 71959681 is about 415.9390955740.

The spelling of 71959681 in words is "seventy-one million, nine hundred fifty-nine thousand, six hundred eighty-one".