102219375491 has 4 divisors (see below), whose sum is σ = 102223803000. Its totient is φ = 102214947984.

The previous prime is 102219375481. The next prime is 102219375509. The reversal of 102219375491 is 194573912201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102219375491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102219375481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178941 + ... + 2225358.

It is an arithmetic number, because the mean of its divisors is an integer number (25555950750).

Almost surely, 2^102219375491 is an apocalyptic number.

102219375491 is a deficient number, since it is larger than the sum of its proper divisors (4427509).

102219375491 is an equidigital number, since it uses as much as digits as its factorization.

102219375491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427508.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 102219375491 in words is "one hundred two billion, two hundred nineteen million, three hundred seventy-five thousand, four hundred ninety-one".