201181781449 has 16 divisors (see below), whose sum is σ = 221141676096. Its totient is φ = 181505016000.

The previous prime is 201181781431. The next prime is 201181781503. The reversal of 201181781449 is 944187181102.

It is not a de Polignac number, because 201181781449 - 2⁷ = 201181781321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201181781399 and 201181781408.

It is not an unprimeable number, because it can be changed into a prime (201181781419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743374 + ... + 977224.

It is an arithmetic number, because the mean of its divisors is an integer number (13821354756).

Almost surely, 2^201181781449 is an apocalyptic number.

It is an amenable number.

201181781449 is a deficient number, since it is larger than the sum of its proper divisors (19959894647).

201181781449 is a wasteful number, since it uses less digits than its factorization.

201181781449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234456.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 201181781449 in words is "two hundred one billion, one hundred eighty-one million, seven hundred eighty-one thousand, four hundred forty-nine".