189516108644431 has 2 divisors, whose sum is σ = 189516108644432. Its totient is φ = 189516108644430.

The previous prime is 189516108644323. The next prime is 189516108644437. The reversal of 189516108644431 is 134446801615981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (134446801615981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189516108644431 - 2⁴¹ = 187317085388879 is a prime.

It is a super-2 number, since 2×189516108644431² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 189516108644431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189516108644437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94758054322215 + 94758054322216.

It is an arithmetic number, because the mean of its divisors is an integer number (94758054322216).

Almost surely, 2^{189516108644431} is an apocalyptic number.

189516108644431 is a deficient number, since it is larger than the sum of its proper divisors (1).

189516108644431 is an equidigital number, since it uses as much as digits as its factorization.

189516108644431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 61.

The spelling of 189516108644431 in words is "one hundred eighty-nine trillion, five hundred sixteen billion, one hundred eight million, six hundred forty-four thousand, four hundred thirty-one".