189931650409 has 2 divisors, whose sum is σ = 189931650410. Its totient is φ = 189931650408.

The previous prime is 189931650341. The next prime is 189931650473. The reversal of 189931650409 is 904056139981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189771754384 + 159896025 = 435628^2 + 12645^2 .

It is a cyclic number.

It is not a de Polignac number, because 189931650409 - 2⁷ = 189931650281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189931650409.

It is not a weakly prime, because it can be changed into another prime (189931650479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94965825204 + 94965825205.

It is an arithmetic number, because the mean of its divisors is an integer number (94965825205).

Almost surely, 2^189931650409 is an apocalyptic number.

It is an amenable number.

189931650409 is a deficient number, since it is larger than the sum of its proper divisors (1).

189931650409 is an equidigital number, since it uses as much as digits as its factorization.

189931650409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 189931650409 in words is "one hundred eighty-nine billion, nine hundred thirty-one million, six hundred fifty thousand, four hundred nine".