209491549084 has 12 divisors (see below), whose sum is σ = 366830673664. Its totient is φ = 104682785184.

The previous prime is 209491549081. The next prime is 209491549097. The reversal of 209491549084 is 480945194902.

It is a super-2 number, since 2×209491549084² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209491549081) 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, 15739857 + ... + 15753160.

Almost surely, 2^209491549084 is an apocalyptic number.

It is an amenable number.

209491549084 is a deficient number, since it is larger than the sum of its proper divisors (157339124580).

209491549084 is a wasteful number, since it uses less digits than its factorization.

209491549084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31494684 (or 31494682 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 209491549084 in words is "two hundred nine billion, four hundred ninety-one million, five hundred forty-nine thousand, eighty-four".