81497101 has 4 divisors (see below), whose sum is σ = 93139552. Its totient is φ = 69854652.

The previous prime is 81497081. The next prime is 81497131. The reversal of 81497101 is 10179418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10179418 = 2 ⋅5089709.

It is not a de Polignac number, because 81497101 - 2¹⁵ = 81464333 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 (81497131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5821215 + ... + 5821228.

It is an arithmetic number, because the mean of its divisors is an integer number (23284888).

Almost surely, 2^81497101 is an apocalyptic number.

It is an amenable number.

81497101 is a deficient number, since it is larger than the sum of its proper divisors (11642451).

81497101 is a wasteful number, since it uses less digits than its factorization.

81497101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11642450.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 81497101 is about 9027.5744804460. The cubic root of 81497101 is about 433.5581822578.

The spelling of 81497101 in words is "eighty-one million, four hundred ninety-seven thousand, one hundred one".