81062489 has 8 divisors (see below), whose sum is σ = 84292608. Its totient is φ = 77870880.

The previous prime is 81062441. The next prime is 81062491. The reversal of 81062489 is 98426018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81062489 - 2¹⁶ = 80996953 is a prime.

It is a super-3 number, since 3×81062489³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81062089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5297 + ... + 13790.

It is an arithmetic number, because the mean of its divisors is an integer number (10536576).

Almost surely, 2^81062489 is an apocalyptic number.

It is an amenable number.

81062489 is a deficient number, since it is larger than the sum of its proper divisors (3230119).

81062489 is a wasteful number, since it uses less digits than its factorization.

81062489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19255.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81062489 is about 9003.4709418091. The cubic root of 81062489 is about 432.7861075949.

The spelling of 81062489 in words is "eighty-one million, sixty-two thousand, four hundred eighty-nine".