81102541 has 8 divisors (see below), whose sum is σ = 90159104. Its totient is φ = 72448560.

The previous prime is 81102523. The next prime is 81102559. The reversal of 81102541 is 14520118.

It is an interprime number because it is at equal distance from previous prime (81102523) and next prime (81102559).

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

It is a cyclic number.

It is not a de Polignac number, because 81102541 - 2⁹ = 81102029 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 (81102341) 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, 100221 + ... + 101026.

It is an arithmetic number, because the mean of its divisors is an integer number (11269888).

Almost surely, 2^81102541 is an apocalyptic number.

It is an amenable number.

81102541 is a deficient number, since it is larger than the sum of its proper divisors (9056563).

81102541 is a wasteful number, since it uses less digits than its factorization.

81102541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201291.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 81102541 is about 9005.6949204378. The cubic root of 81102541 is about 432.8573739942.

Adding to 81102541 its reverse (14520118), we get a palindrome (95622659).

The spelling of 81102541 in words is "eighty-one million, one hundred two thousand, five hundred forty-one".