161574121 has 2 divisors, whose sum is σ = 161574122. Its totient is φ = 161574120.

The previous prime is 161574113. The next prime is 161574131. The reversal of 161574121 is 121475161.

161574121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140090896 + 21483225 = 11836^2 + 4635^2 .

It is an emirp because it is prime and its reverse (121475161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161574121 - 2³ = 161574113 is a prime.

It is a super-2 number, since 2×161574121² = 52212393153845282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161574121.

It is not a weakly prime, because it can be changed into another prime (161574131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80787060 + 80787061.

It is an arithmetic number, because the mean of its divisors is an integer number (80787061).

Almost surely, 2^161574121 is an apocalyptic number.

It is an amenable number.

161574121 is a deficient number, since it is larger than the sum of its proper divisors (1).

161574121 is an equidigital number, since it uses as much as digits as its factorization.

161574121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 161574121 is about 12711.1809443497. The cubic root of 161574121 is about 544.6580589398.

The spelling of 161574121 in words is "one hundred sixty-one million, five hundred seventy-four thousand, one hundred twenty-one".