161943151 has 4 divisors (see below), whose sum is σ = 162496152. Its totient is φ = 161390152.

The previous prime is 161943107. The next prime is 161943157. The reversal of 161943151 is 151349161.

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

It is a cyclic number.

It is not a de Polignac number, because 161943151 - 2¹⁵ = 161910383 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 (161943157) 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, 276061 + ... + 276646.

It is an arithmetic number, because the mean of its divisors is an integer number (40624038).

Almost surely, 2^161943151 is an apocalyptic number.

161943151 is a deficient number, since it is larger than the sum of its proper divisors (553001).

161943151 is an equidigital number, since it uses as much as digits as its factorization.

161943151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553000.

The product of its digits is 3240, while the sum is 31.

The square root of 161943151 is about 12725.6886257680. The cubic root of 161943151 is about 545.0724040383.

The spelling of 161943151 in words is "one hundred sixty-one million, nine hundred forty-three thousand, one hundred fifty-one".