161950849 has 4 divisors (see below), whose sum is σ = 161993520. Its totient is φ = 161908180.

The previous prime is 161950847. The next prime is 161950853. The reversal of 161950849 is 948059161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 948059161 = 7 ⋅135437023.

It is a cyclic number.

It is not a de Polignac number, because 161950849 - 2¹ = 161950847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161950847) 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, 15019 + ... + 23440.

It is an arithmetic number, because the mean of its divisors is an integer number (40498380).

Almost surely, 2^161950849 is an apocalyptic number.

It is an amenable number.

161950849 is a deficient number, since it is larger than the sum of its proper divisors (42671).

161950849 is an equidigital number, since it uses as much as digits as its factorization.

161950849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42670.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 161950849 is about 12725.9910812479. The cubic root of 161950849 is about 545.0810406099.

The spelling of 161950849 in words is "one hundred sixty-one million, nine hundred fifty thousand, eight hundred forty-nine".