103129861 has 4 divisors (see below), whose sum is σ = 107613792. Its totient is φ = 98645932.

The previous prime is 103129811. The next prime is 103129909. The reversal of 103129861 is 168921301.

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: 168921301 = 163 ⋅1036327.

It is a cyclic number.

It is not a de Polignac number, because 103129861 - 2⁹ = 103129349 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 (103129811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2241931 + ... + 2241976.

It is an arithmetic number, because the mean of its divisors is an integer number (26903448).

Almost surely, 2^103129861 is an apocalyptic number.

It is an amenable number.

103129861 is a deficient number, since it is larger than the sum of its proper divisors (4483931).

103129861 is an equidigital number, since it uses as much as digits as its factorization.

103129861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4483930.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 103129861 is about 10155.2873420696. The cubic root of 103129861 is about 468.9517319314.

The spelling of 103129861 in words is "one hundred three million, one hundred twenty-nine thousand, eight hundred sixty-one".