71113981 has 4 divisors (see below), whose sum is σ = 71804512. Its totient is φ = 70423452.

The previous prime is 71113949. The next prime is 71113993. The reversal of 71113981 is 18931117.

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.

It is a cyclic number.

It is not a de Polignac number, because 71113981 - 2⁵ = 71113949 is a prime.

It is a super-3 number, since 3×71113981³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71113921) 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, 345111 + ... + 345316.

It is an arithmetic number, because the mean of its divisors is an integer number (17951128).

Almost surely, 2^71113981 is an apocalyptic number.

It is an amenable number.

71113981 is a deficient number, since it is larger than the sum of its proper divisors (690531).

71113981 is a wasteful number, since it uses less digits than its factorization.

71113981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690530.

The product of its digits is 1512, while the sum is 31.

The square root of 71113981 is about 8432.9105888774. The cubic root of 71113981 is about 414.3032407681.

The spelling of 71113981 in words is "seventy-one million, one hundred thirteen thousand, nine hundred eighty-one".