209545253192 has 36 divisors (see below), whose sum is σ = 431891730585. Its totient is φ = 95241368640.

The previous prime is 209545253149. The next prime is 209545253201. The reversal of 209545253192 is 291352545902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 196573409956 + 12971843236 = 443366^2 + 113894^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=323686.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14234828 + ... + 14249540.

Almost surely, 2^209545253192 is an apocalyptic number.

209545253192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209545253192 is an abundant number, since it is smaller than the sum of its proper divisors (222346477393).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209545253192 is an frugal number, since it uses more digits than its factorization.

209545253192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29454 (or 14726 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 209545253192 in words is "two hundred nine billion, five hundred forty-five million, two hundred fifty-three thousand, one hundred ninety-two".