161275493 has 2 divisors, whose sum is σ = 161275494. Its totient is φ = 161275492.

The previous prime is 161275483. The next prime is 161275501. The reversal of 161275493 is 394572161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89737729 + 71537764 = 9473^2 + 8458^2 .

It is an emirp because it is prime and its reverse (394572161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161275493 - 2¹⁰ = 161274469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161275403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80637746 + 80637747.

It is an arithmetic number, because the mean of its divisors is an integer number (80637747).

Almost surely, 2^161275493 is an apocalyptic number.

It is an amenable number.

161275493 is a deficient number, since it is larger than the sum of its proper divisors (1).

161275493 is an equidigital number, since it uses as much as digits as its factorization.

161275493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 161275493 is about 12699.4288454245. The cubic root of 161275493 is about 544.3222987854.

The spelling of 161275493 in words is "one hundred sixty-one million, two hundred seventy-five thousand, four hundred ninety-three".