161772953 has 2 divisors, whose sum is σ = 161772954. Its totient is φ = 161772952.

The previous prime is 161772943. The next prime is 161772971. The reversal of 161772953 is 359277161.

161772953 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., 157051024 + 4721929 = 12532^2 + 2173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161772953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161772953.

It is not a weakly prime, because it can be changed into another prime (161772943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80886476 + 80886477.

It is an arithmetic number, because the mean of its divisors is an integer number (80886477).

Almost surely, 2^161772953 is an apocalyptic number.

It is an amenable number.

161772953 is a deficient number, since it is larger than the sum of its proper divisors (1).

161772953 is an equidigital number, since it uses as much as digits as its factorization.

161772953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 161772953 is about 12718.9996855099. Note that the first 3 decimals coincide. The cubic root of 161772953 is about 544.8813848418.

The spelling of 161772953 in words is "one hundred sixty-one million, seven hundred seventy-two thousand, nine hundred fifty-three".