71596981 has 8 divisors (see below), whose sum is σ = 73497528. Its totient is φ = 69720000.

The previous prime is 71596963. The next prime is 71597023. The reversal of 71596981 is 18969517.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1188100 + 70408881 = 1090^2 + 8391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71596981 - 2¹⁹ = 71072693 is a prime.

It is a super-2 number, since 2×71596981² = 10252255376628722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71596951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (9187191).

Almost surely, 2^71596981 is an apocalyptic number.

It is an amenable number.

71596981 is a deficient number, since it is larger than the sum of its proper divisors (1900547).

71596981 is a wasteful number, since it uses less digits than its factorization.

71596981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11783.

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

The square root of 71596981 is about 8461.4999261360. The cubic root of 71596981 is about 415.2390957830.

The spelling of 71596981 in words is "seventy-one million, five hundred ninety-six thousand, nine hundred eighty-one".