161644151 has 4 divisors (see below), whose sum is σ = 163154952. Its totient is φ = 160133352.

The previous prime is 161644123. The next prime is 161644163. The reversal of 161644151 is 151446161.

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-161644151 is a prime.

It is a super-2 number, since 2×161644151² = 52257663105021602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161644121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755240 + ... + 755453.

It is an arithmetic number, because the mean of its divisors is an integer number (40788738).

Almost surely, 2^161644151 is an apocalyptic number.

161644151 is a deficient number, since it is larger than the sum of its proper divisors (1510801).

161644151 is a wasteful number, since it uses less digits than its factorization.

161644151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510800.

The product of its digits is 2880, while the sum is 29.

The square root of 161644151 is about 12713.9353073704. The cubic root of 161644151 is about 544.7367367510.

The spelling of 161644151 in words is "one hundred sixty-one million, six hundred forty-four thousand, one hundred fifty-one".