209148019 has 8 divisors (see below), whose sum is σ = 210728448. Its totient is φ = 207574080.

The previous prime is 209147987. The next prime is 209148083. The reversal of 209148019 is 910841902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209148019 - 2⁵ = 209147987 is a prime.

It is a super-2 number, since 2×209148019² = 87485787703248722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209148089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76494 + ... + 79180.

It is an arithmetic number, because the mean of its divisors is an integer number (26341056).

Almost surely, 2^209148019 is an apocalyptic number.

209148019 is a deficient number, since it is larger than the sum of its proper divisors (1580429).

209148019 is a wasteful number, since it uses less digits than its factorization.

209148019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 209148019 is about 14461.9507328714. The cubic root of 209148019 is about 593.5872790068.

The spelling of 209148019 in words is "two hundred nine million, one hundred forty-eight thousand, nineteen".