161423461 has 2 divisors, whose sum is σ = 161423462. Its totient is φ = 161423460.

The previous prime is 161423443. The next prime is 161423473. The reversal of 161423461 is 164324161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158911236 + 2512225 = 12606^2 + 1585^2 .

It is an emirp because it is prime and its reverse (164324161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161423461 - 2¹⁹ = 160899173 is a prime.

It is a super-2 number, since 2×161423461² = 52115067522437042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161423491) 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, 80711730 + 80711731.

It is an arithmetic number, because the mean of its divisors is an integer number (80711731).

Almost surely, 2^161423461 is an apocalyptic number.

It is an amenable number.

161423461 is a deficient number, since it is larger than the sum of its proper divisors (1).

161423461 is an equidigital number, since it uses as much as digits as its factorization.

161423461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 161423461 is about 12705.2532835831. The cubic root of 161423461 is about 544.4887172553.

The spelling of 161423461 in words is "one hundred sixty-one million, four hundred twenty-three thousand, four hundred sixty-one".