161203853 has 2 divisors, whose sum is σ = 161203854. Its totient is φ = 161203852.

The previous prime is 161203817. The next prime is 161203891. The reversal of 161203853 is 358302161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139877929 + 21325924 = 11827^2 + 4618^2 .

It is a cyclic number.

It is not a de Polignac number, because 161203853 - 2¹² = 161199757 is a prime.

It is a Sophie Germain 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 (161203253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80601926 + 80601927.

It is an arithmetic number, because the mean of its divisors is an integer number (80601927).

Almost surely, 2^161203853 is an apocalyptic number.

It is an amenable number.

161203853 is a deficient number, since it is larger than the sum of its proper divisors (1).

161203853 is an equidigital number, since it uses as much as digits as its factorization.

161203853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 161203853 is about 12696.6079328299. The cubic root of 161203853 is about 544.2416892557.

The spelling of 161203853 in words is "one hundred sixty-one million, two hundred three thousand, eight hundred fifty-three".