161261205 has 48 divisors (see below), whose sum is σ = 302338944. Its totient is φ = 73180800.

The previous prime is 161261197. The next prime is 161261209. The reversal of 161261205 is 502162161.

161261205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161261205 - 2³ = 161261197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161261209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110259 + ... + 111711.

It is an arithmetic number, because the mean of its divisors is an integer number (6298728).

Almost surely, 2^161261205 is an apocalyptic number.

161261205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161261205 is a deficient number, since it is larger than the sum of its proper divisors (141077739).

161261205 is a wasteful number, since it uses less digits than its factorization.

161261205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1619 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161261205 is about 12698.8662879802. The cubic root of 161261205 is about 544.3062237936.

The spelling of 161261205 in words is "one hundred sixty-one million, two hundred sixty-one thousand, two hundred five".