81742101 has 8 divisors (see below), whose sum is σ = 124559424. Its totient is φ = 46709760.

The previous prime is 81742099. The next prime is 81742109. The reversal of 81742101 is 10124718.

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

It is not a de Polignac number, because 81742101 - 2¹ = 81742099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81742109) 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, 1946220 + ... + 1946261.

It is an arithmetic number, because the mean of its divisors is an integer number (15569928).

Almost surely, 2^81742101 is an apocalyptic number.

It is an amenable number.

81742101 is a deficient number, since it is larger than the sum of its proper divisors (42817323).

81742101 is a wasteful number, since it uses less digits than its factorization.

81742101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892491.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81742101 is about 9041.1338337622. The cubic root of 81742101 is about 433.9922078775.

Adding to 81742101 its reverse (10124718), we get a palindrome (91866819).

The spelling of 81742101 in words is "eighty-one million, seven hundred forty-two thousand, one hundred one".