71097891 has 16 divisors (see below), whose sum is σ = 96940800. Its totient is φ = 46335968.

The previous prime is 71097889. The next prime is 71097907. The reversal of 71097891 is 19879017.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71097891 - 2¹ = 71097889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71097841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33850 + ... + 35888.

It is an arithmetic number, because the mean of its divisors is an integer number (6058800).

Almost surely, 2^71097891 is an apocalyptic number.

71097891 is a deficient number, since it is larger than the sum of its proper divisors (25842909).

71097891 is a wasteful number, since it uses less digits than its factorization.

71097891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 71097891 is about 8431.9565345180. The cubic root of 71097891 is about 414.2719921450.

The spelling of 71097891 in words is "seventy-one million, ninety-seven thousand, eight hundred ninety-one".