81113401 has 4 divisors (see below), whose sum is σ = 81233892. Its totient is φ = 80992912.

The previous prime is 81113353. The next prime is 81113407. The reversal of 81113401 is 10431118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10431118 = 2 ⋅5215559.

It can be written as a sum of positive squares in 2 ways, for example, as 67980025 + 13133376 = 8245^2 + 3624^2 .

It is a cyclic number.

It is not a de Polignac number, because 81113401 - 2¹¹ = 81111353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81113407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59230 + ... + 60583.

It is an arithmetic number, because the mean of its divisors is an integer number (20308473).

Almost surely, 2^81113401 is an apocalyptic number.

It is an amenable number.

81113401 is a deficient number, since it is larger than the sum of its proper divisors (120491).

81113401 is a wasteful number, since it uses less digits than its factorization.

81113401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120490.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 81113401 is about 9006.2978520589. The cubic root of 81113401 is about 432.8766936572.

Adding to 81113401 its reverse (10431118), we get a palindrome (91544519).

The spelling of 81113401 in words is "eighty-one million, one hundred thirteen thousand, four hundred one".