189397180421281 has 8 divisors (see below), whose sum is σ = 217192671065664. Its totient is φ = 161786377422960.

The previous prime is 189397180421237. The next prime is 189397180421347. The reversal of 189397180421281 is 182124081793981.

It is a happy number.

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 189397180421281 - 2⁹ = 189397180420769 is a prime.

It is a super-2 number, since 2×189397180421281² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189397180421081) 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, 46171909315 + ... + 46171913416.

It is an arithmetic number, because the mean of its divisors is an integer number (27149083883208).

Almost surely, 2^{189397180421281} is an apocalyptic number.

It is an amenable number.

189397180421281 is a deficient number, since it is larger than the sum of its proper divisors (27795490644383).

189397180421281 is an equidigital number, since it uses as much as digits as its factorization.

189397180421281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92343823031.

The product of its (nonzero) digits is 13934592, while the sum is 64.

The spelling of 189397180421281 in words is "one hundred eighty-nine trillion, three hundred ninety-seven billion, one hundred eighty million, four hundred twenty-one thousand, two hundred eighty-one".