71155986 has 24 divisors (see below), whose sum is σ = 156427152. Its totient is φ = 21562200.

The previous prime is 71155967. The next prime is 71155991. The reversal of 71155986 is 68955117.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48280 + ... + 49731.

It is an arithmetic number, because the mean of its divisors is an integer number (6517798).

Almost surely, 2^71155986 is an apocalyptic number.

71155986 is an abundant number, since it is smaller than the sum of its proper divisors (85271166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71155986 is a wasteful number, since it uses less digits than its factorization.

71155986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98038 (or 98027 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The square root of 71155986 is about 8435.4007610783. The cubic root of 71155986 is about 414.3847970812.

The spelling of 71155986 in words is "seventy-one million, one hundred fifty-five thousand, nine hundred eighty-six".