189979303961 has 2 divisors, whose sum is σ = 189979303962. Its totient is φ = 189979303960.

The previous prime is 189979303939. The next prime is 189979303967. The reversal of 189979303961 is 169303979981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188425446400 + 1553857561 = 434080^2 + 39419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189979303961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189979303967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94989651980 + 94989651981.

It is an arithmetic number, because the mean of its divisors is an integer number (94989651981).

Almost surely, 2^189979303961 is an apocalyptic number.

It is an amenable number.

189979303961 is a deficient number, since it is larger than the sum of its proper divisors (1).

189979303961 is an equidigital number, since it uses as much as digits as its factorization.

189979303961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19840464, while the sum is 65.

The spelling of 189979303961 in words is "one hundred eighty-nine billion, nine hundred seventy-nine million, three hundred three thousand, nine hundred sixty-one".