81249147103 has 4 divisors (see below), whose sum is σ = 81251188480. Its totient is φ = 81247105728.

The previous prime is 81249147017. The next prime is 81249147137. The reversal of 81249147103 is 30174194218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81249147103 - 2²⁹ = 80712276191 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 (81249157103) 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, 959775 + ... + 1040992.

It is an arithmetic number, because the mean of its divisors is an integer number (20312797120).

Almost surely, 2^81249147103 is an apocalyptic number.

81249147103 is a deficient number, since it is larger than the sum of its proper divisors (2041377).

81249147103 is a wasteful number, since it uses less digits than its factorization.

81249147103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041376.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 81249147103 in words is "eighty-one billion, two hundred forty-nine million, one hundred forty-seven thousand, one hundred three".