218103961 has 4 divisors (see below), whose sum is σ = 221359312. Its totient is φ = 214848612.

The previous prime is 218103953. The next prime is 218103967. The reversal of 218103961 is 169301812.

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.

It is a cyclic number.

It is not a de Polignac number, because 218103961 - 2³ = 218103953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218103967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627575 + ... + 1627708.

It is an arithmetic number, because the mean of its divisors is an integer number (55339828).

Almost surely, 2^218103961 is an apocalyptic number.

It is an amenable number.

218103961 is a deficient number, since it is larger than the sum of its proper divisors (3255351).

218103961 is an equidigital number, since it uses as much as digits as its factorization.

218103961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255350.

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

The square root of 218103961 is about 14768.3432043002. The cubic root of 218103961 is about 601.9418208107.

The spelling of 218103961 in words is "two hundred eighteen million, one hundred three thousand, nine hundred sixty-one".