103231221990161 has 2 divisors, whose sum is σ = 103231221990162. Its totient is φ = 103231221990160.

The previous prime is 103231221990137. The next prime is 103231221990223. The reversal of 103231221990161 is 161099122132301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77423104921600 + 25808117068561 = 8799040^2 + 5080169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103231221990161 is a prime.

It is not a weakly prime, because it can be changed into another prime (103231221990761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51615610995080 + 51615610995081.

It is an arithmetic number, because the mean of its divisors is an integer number (51615610995081).

Almost surely, 2^{103231221990161} is an apocalyptic number.

It is an amenable number.

103231221990161 is a deficient number, since it is larger than the sum of its proper divisors (1).

103231221990161 is an equidigital number, since it uses as much as digits as its factorization.

103231221990161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 103231221990161 in words is "one hundred three trillion, two hundred thirty-one billion, two hundred twenty-one million, nine hundred ninety thousand, one hundred sixty-one".