121472161 has 2 divisors, whose sum is σ = 121472162. Its totient is φ = 121472160.

The previous prime is 121472137. The next prime is 121472171. The reversal of 121472161 is 161274121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117310561 + 4161600 = 10831^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 121472161 - 2⁵ = 121472129 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (121472171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60736080 + 60736081.

It is an arithmetic number, because the mean of its divisors is an integer number (60736081).

Almost surely, 2^121472161 is an apocalyptic number.

It is an amenable number.

121472161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121472161 is an equidigital number, since it uses as much as digits as its factorization.

121472161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 121472161 is about 11021.4409674960. The cubic root of 121472161 is about 495.2512563160.

The spelling of 121472161 in words is "one hundred twenty-one million, four hundred seventy-two thousand, one hundred sixty-one".