161419121 has 2 divisors, whose sum is σ = 161419122. Its totient is φ = 161419120.

The previous prime is 161419087. The next prime is 161419127. The reversal of 161419121 is 121914161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 36784225 = 11164^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 161419121 - 2⁶ = 161419057 is a prime.

It is a super-2 number, since 2×161419121² = 52112265248825282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161419127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80709560 + 80709561.

It is an arithmetic number, because the mean of its divisors is an integer number (80709561).

Almost surely, 2^161419121 is an apocalyptic number.

It is an amenable number.

161419121 is a deficient number, since it is larger than the sum of its proper divisors (1).

161419121 is an equidigital number, since it uses as much as digits as its factorization.

161419121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 161419121 is about 12705.0824869420. The cubic root of 161419121 is about 544.4838375387.

The spelling of 161419121 in words is "one hundred sixty-one million, four hundred nineteen thousand, one hundred twenty-one".