71234987 has 4 divisors (see below), whose sum is σ = 71272656. Its totient is φ = 71197320.

The previous prime is 71234983. The next prime is 71235001. The reversal of 71234987 is 78943217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78943217 = 103 ⋅766439.

It is a cyclic number.

It is not a de Polignac number, because 71234987 - 2² = 71234983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71234983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15839 + ... + 19832.

It is an arithmetic number, because the mean of its divisors is an integer number (17818164).

Almost surely, 2^71234987 is an apocalyptic number.

71234987 is a deficient number, since it is larger than the sum of its proper divisors (37669).

71234987 is a wasteful number, since it uses less digits than its factorization.

71234987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37668.

The product of its digits is 84672, while the sum is 41.

The square root of 71234987 is about 8440.0821678465. The cubic root of 71234987 is about 414.5380973974.

The spelling of 71234987 in words is "seventy-one million, two hundred thirty-four thousand, nine hundred eighty-seven".