161205151 has 4 divisors (see below), whose sum is σ = 164954152. Its totient is φ = 157456152.

The previous prime is 161205103. The next prime is 161205167. The reversal of 161205151 is 151502161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161205151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161205181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874436 + ... + 1874521.

It is an arithmetic number, because the mean of its divisors is an integer number (41238538).

Almost surely, 2^161205151 is an apocalyptic number.

161205151 is a deficient number, since it is larger than the sum of its proper divisors (3749001).

161205151 is an equidigital number, since it uses as much as digits as its factorization.

161205151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749000.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 161205151 is about 12696.6590487419. The cubic root of 161205151 is about 544.2431499814.

The spelling of 161205151 in words is "one hundred sixty-one million, two hundred five thousand, one hundred fifty-one".