81499485 has 16 divisors (see below), whose sum is σ = 131233536. Its totient is φ = 43188288.

The previous prime is 81499447. The next prime is 81499487. The reversal of 81499485 is 58499418.

It is not a de Polignac number, because 81499485 - 2⁷ = 81499357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81499487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14949 + ... + 19658.

It is an arithmetic number, because the mean of its divisors is an integer number (8202096).

Almost surely, 2^81499485 is an apocalyptic number.

It is an amenable number.

81499485 is a deficient number, since it is larger than the sum of its proper divisors (49734051).

81499485 is a wasteful number, since it uses less digits than its factorization.

81499485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34772.

The product of its digits is 414720, while the sum is 48.

The square root of 81499485 is about 9027.7065193769. The cubic root of 81499485 is about 433.5624097809.

The spelling of 81499485 in words is "eighty-one million, four hundred ninety-nine thousand, four hundred eighty-five".