189573237281 has 4 divisors (see below), whose sum is σ = 191857252272. Its totient is φ = 187289222292.

The previous prime is 189573237277. The next prime is 189573237299. The reversal of 189573237281 is 182732375981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189573237281 - 2² = 189573237277 is a prime.

It is a super-2 number, since 2×189573237281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189573297281) 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, 1142007371 + ... + 1142007536.

It is an arithmetic number, because the mean of its divisors is an integer number (47964313068).

Almost surely, 2^189573237281 is an apocalyptic number.

It is an amenable number.

189573237281 is a deficient number, since it is larger than the sum of its proper divisors (2284014991).

189573237281 is an equidigital number, since it uses as much as digits as its factorization.

189573237281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284014990.

The product of its digits is 5080320, while the sum is 56.

The spelling of 189573237281 in words is "one hundred eighty-nine billion, five hundred seventy-three million, two hundred thirty-seven thousand, two hundred eighty-one".