81489175 has 6 divisors (see below), whose sum is σ = 101046608. Its totient is φ = 65191320.

The previous prime is 81489091. The next prime is 81489197. The reversal of 81489175 is 57198418.

It is a happy number.

It is not a de Polignac number, because 81489175 - 2¹⁹ = 80964887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1629759 + ... + 1629808.

Almost surely, 2^81489175 is an apocalyptic number.

81489175 is a deficient number, since it is larger than the sum of its proper divisors (19557433).

81489175 is a wasteful number, since it uses less digits than its factorization.

81489175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259577 (or 3259572 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 81489175 is about 9027.1354814249. The cubic root of 81489175 is about 433.5441265694.

The spelling of 81489175 in words is "eighty-one million, four hundred eighty-nine thousand, one hundred seventy-five".