189475642987 has 2 divisors, whose sum is σ = 189475642988. Its totient is φ = 189475642986.

The previous prime is 189475642859. The next prime is 189475643009. The reversal of 189475642987 is 789246574981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189475642987 - 2⁷ = 189475642859 is a prime.

It is not a weakly prime, because it can be changed into another prime (189475642787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94737821493 + 94737821494.

It is an arithmetic number, because the mean of its divisors is an integer number (94737821494).

Almost surely, 2^189475642987 is an apocalyptic number.

189475642987 is a deficient number, since it is larger than the sum of its proper divisors (1).

189475642987 is an equidigital number, since it uses as much as digits as its factorization.

189475642987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243855360, while the sum is 70.

The spelling of 189475642987 in words is "one hundred eighty-nine billion, four hundred seventy-five million, six hundred forty-two thousand, nine hundred eighty-seven".