161535953 has 2 divisors, whose sum is σ = 161535954. Its totient is φ = 161535952.

The previous prime is 161535949. The next prime is 161536021. The reversal of 161535953 is 359535161.

161535953 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., 161366209 + 169744 = 12703^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 161535953 - 2² = 161535949 is a prime.

It is a super-2 number, since 2×161535953² = 52187728223236418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161535053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80767976 + 80767977.

It is an arithmetic number, because the mean of its divisors is an integer number (80767977).

Almost surely, 2^161535953 is an apocalyptic number.

It is an amenable number.

161535953 is a deficient number, since it is larger than the sum of its proper divisors (1).

161535953 is an equidigital number, since it uses as much as digits as its factorization.

161535953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 38.

The square root of 161535953 is about 12709.6795002864. The cubic root of 161535953 is about 544.6151681067.

The spelling of 161535953 in words is "one hundred sixty-one million, five hundred thirty-five thousand, nine hundred fifty-three".