161377949 has 4 divisors (see below), whose sum is σ = 161840700. Its totient is φ = 160915200.

The previous prime is 161377933. The next prime is 161377969. The reversal of 161377949 is 949773161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 149695225 + 11682724 = 12235^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 161377949 - 2⁴ = 161377933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161377919) 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, 230852 + ... + 231549.

It is an arithmetic number, because the mean of its divisors is an integer number (40460175).

Almost surely, 2^161377949 is an apocalyptic number.

It is an amenable number.

161377949 is a deficient number, since it is larger than the sum of its proper divisors (462751).

161377949 is an equidigital number, since it uses as much as digits as its factorization.

161377949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462750.

The product of its digits is 285768, while the sum is 47.

The square root of 161377949 is about 12703.4620871635. The cubic root of 161377949 is about 544.4375410928.

The spelling of 161377949 in words is "one hundred sixty-one million, three hundred seventy-seven thousand, nine hundred forty-nine".