219939587149 has 4 divisors (see below), whose sum is σ = 219961457820. Its totient is φ = 219917716480.

The previous prime is 219939587099. The next prime is 219939587159. The reversal of 219939587149 is 941785939912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 169543827049 + 50395760100 = 411757^2 + 224490^2 .

It is a cyclic number.

It is not a de Polignac number, because 219939587149 - 2²⁹ = 219402716237 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 (219939587159) 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, 10920244 + ... + 10940365.

It is an arithmetic number, because the mean of its divisors is an integer number (54990364455).

Almost surely, 2^219939587149 is an apocalyptic number.

It is an amenable number.

219939587149 is a deficient number, since it is larger than the sum of its proper divisors (21870671).

219939587149 is a wasteful number, since it uses less digits than its factorization.

219939587149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21870670.

The product of its digits is 44089920, while the sum is 67.

The spelling of 219939587149 in words is "two hundred nineteen billion, nine hundred thirty-nine million, five hundred eighty-seven thousand, one hundred forty-nine".