161776149 has 4 divisors (see below), whose sum is σ = 215701536. Its totient is φ = 107850764.

The previous prime is 161776093. The next prime is 161776151. The reversal of 161776149 is 941677161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161776149 - 2¹⁵ = 161743381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161776149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736149) 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, 26962689 + ... + 26962694.

It is an arithmetic number, because the mean of its divisors is an integer number (53925384).

Almost surely, 2^161776149 is an apocalyptic number.

It is an amenable number.

161776149 is a deficient number, since it is larger than the sum of its proper divisors (53925387).

161776149 is an equidigital number, since it uses as much as digits as its factorization.

161776149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53925386.

The product of its digits is 63504, while the sum is 42.

The square root of 161776149 is about 12719.1253237005. The cubic root of 161776149 is about 544.8849730590.

The spelling of 161776149 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, one hundred forty-nine".