81140603 has 4 divisors (see below), whose sum is σ = 81477528. Its totient is φ = 80803680.

The previous prime is 81140537. The next prime is 81140611. The reversal of 81140603 is 30604118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30604118 = 2 ⋅15302059.

It is a cyclic number.

It is not a de Polignac number, because 81140603 - 2¹⁶ = 81075067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81140623) 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, 168101 + ... + 168582.

It is an arithmetic number, because the mean of its divisors is an integer number (20369382).

Almost surely, 2^81140603 is an apocalyptic number.

81140603 is a deficient number, since it is larger than the sum of its proper divisors (336925).

81140603 is a wasteful number, since it uses less digits than its factorization.

81140603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336924.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81140603 is about 9007.8078909355. The cubic root of 81140603 is about 432.9250777533.

It can be divided in two parts, 811 and 40603, that added together give a palindrome (41414).

The spelling of 81140603 in words is "eighty-one million, one hundred forty thousand, six hundred three".