71891331 has 4 divisors (see below), whose sum is σ = 95855112. Its totient is φ = 47927552.

The previous prime is 71891299. The next prime is 71891389. The reversal of 71891331 is 13319817.

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 71891331 - 2⁵ = 71891299 is a prime.

It is a super-2 number, since 2×71891331² = 10336726945903122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71891292 and 71891301.

It is not an unprimeable number, because it can be changed into a prime (71891431) 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, 11981886 + ... + 11981891.

It is an arithmetic number, because the mean of its divisors is an integer number (23963778).

Almost surely, 2^71891331 is an apocalyptic number.

71891331 is a deficient number, since it is larger than the sum of its proper divisors (23963781).

71891331 is a wasteful number, since it uses less digits than its factorization.

71891331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23963780.

The product of its digits is 4536, while the sum is 33.

The square root of 71891331 is about 8478.8755740369. The cubic root of 71891331 is about 415.8073623466.

The spelling of 71891331 in words is "seventy-one million, eight hundred ninety-one thousand, three hundred thirty-one".