189949178345471 has 2 divisors, whose sum is σ = 189949178345472. Its totient is φ = 189949178345470.

The previous prime is 189949178345447. The next prime is 189949178345483. The reversal of 189949178345471 is 174543871949981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189949178345471 - 2¹⁰ = 189949178344447 is a prime.

It is a super-3 number, since 3×189949178345471³ (a number of 44 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189949178345401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94974589172735 + 94974589172736.

It is an arithmetic number, because the mean of its divisors is an integer number (94974589172736).

Almost surely, 2^{189949178345471} is an apocalyptic number.

189949178345471 is a deficient number, since it is larger than the sum of its proper divisors (1).

189949178345471 is an equidigital number, since it uses as much as digits as its factorization.

189949178345471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2194698240, while the sum is 80.

The spelling of 189949178345471 in words is "one hundred eighty-nine trillion, nine hundred forty-nine billion, one hundred seventy-eight million, three hundred forty-five thousand, four hundred seventy-one".