81597141 has 12 divisors (see below), whose sum is σ = 117976300. Its totient is φ = 54345600.

The previous prime is 81597083. The next prime is 81597151. The reversal of 81597141 is 14179518.

It can be written as a sum of positive squares in 2 ways, for example, as 25796241 + 55800900 = 5079^2 + 7470^2 .

It is not a de Polignac number, because 81597141 - 2¹⁴ = 81580757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81597096 and 81597105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81597151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7035 + ... + 14583.

Almost surely, 2^81597141 is an apocalyptic number.

It is an amenable number.

81597141 is a deficient number, since it is larger than the sum of its proper divisors (36379159).

81597141 is a wasteful number, since it uses less digits than its factorization.

81597141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8756 (or 8753 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 81597141 is about 9033.1135828130. The cubic root of 81597141 is about 433.7355113687.

The spelling of 81597141 in words is "eighty-one million, five hundred ninety-seven thousand, one hundred forty-one".