161225693 has 2 divisors, whose sum is σ = 161225694. Its totient is φ = 161225692.

The previous prime is 161225663. The next prime is 161225707. The reversal of 161225693 is 396522161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129663769 + 31561924 = 11387^2 + 5618^2 .

It is a cyclic number.

It is not a de Polignac number, because 161225693 - 2⁸ = 161225437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161225633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80612846 + 80612847.

It is an arithmetic number, because the mean of its divisors is an integer number (80612847).

Almost surely, 2^161225693 is an apocalyptic number.

It is an amenable number.

161225693 is a deficient number, since it is larger than the sum of its proper divisors (1).

161225693 is an equidigital number, since it uses as much as digits as its factorization.

161225693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 161225693 is about 12697.4679759391. The cubic root of 161225693 is about 544.2662662153.

The spelling of 161225693 in words is "one hundred sixty-one million, two hundred twenty-five thousand, six hundred ninety-three".