103649452681 has 4 divisors (see below), whose sum is σ = 103727562112. Its totient is φ = 103571343252.

The previous prime is 103649452667. The next prime is 103649452691. The reversal of 103649452681 is 186254946301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186254946301 = 19207 ⋅9697243.

It is a cyclic number.

It is not a de Polignac number, because 103649452681 - 2¹⁷ = 103649321609 is a prime.

It is a super-2 number, since 2×103649452681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103649452601) 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, 39052725 + ... + 39055378.

It is an arithmetic number, because the mean of its divisors is an integer number (25931890528).

Almost surely, 2^103649452681 is an apocalyptic number.

It is an amenable number.

103649452681 is a deficient number, since it is larger than the sum of its proper divisors (78109431).

103649452681 is an equidigital number, since it uses as much as digits as its factorization.

103649452681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78109430.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 103649452681 in words is "one hundred three billion, six hundred forty-nine million, four hundred fifty-two thousand, six hundred eighty-one".