81069487 has 4 divisors (see below), whose sum is σ = 81378000. Its totient is φ = 80760976.

The previous prime is 81069467. The next prime is 81069497. The reversal of 81069487 is 78496018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81069487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81069437) 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, 153862 + ... + 154387.

It is an arithmetic number, because the mean of its divisors is an integer number (20344500).

Almost surely, 2^81069487 is an apocalyptic number.

81069487 is a deficient number, since it is larger than the sum of its proper divisors (308513).

81069487 is a wasteful number, since it uses less digits than its factorization.

81069487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308512.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 81069487 is about 9003.8595613215. The cubic root of 81069487 is about 432.7985611562.

The spelling of 81069487 in words is "eighty-one million, sixty-nine thousand, four hundred eighty-seven".