189494632409 has 2 divisors, whose sum is σ = 189494632410. Its totient is φ = 189494632408.

The previous prime is 189494632381. The next prime is 189494632421. The reversal of 189494632409 is 904236494981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176505015625 + 12989616784 = 420125^2 + 113972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189494632409 is a prime.

It is a super-3 number, since 3×189494632409³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (189494632489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94747316204 + 94747316205.

It is an arithmetic number, because the mean of its divisors is an integer number (94747316205).

Almost surely, 2^189494632409 is an apocalyptic number.

It is an amenable number.

189494632409 is a deficient number, since it is larger than the sum of its proper divisors (1).

189494632409 is an equidigital number, since it uses as much as digits as its factorization.

189494632409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13436928, while the sum is 59.

The spelling of 189494632409 in words is "one hundred eighty-nine billion, four hundred ninety-four million, six hundred thirty-two thousand, four hundred nine".