161371769 has 16 divisors (see below), whose sum is σ = 193697280. Its totient is φ = 132814080.

The previous prime is 161371759. The next prime is 161371783. The reversal of 161371769 is 967173161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161371769 - 2¹² = 161367673 is a prime.

It is a super-2 number, since 2×161371769² = 52081695660378722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161371759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15017 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (12106080).

Almost surely, 2^161371769 is an apocalyptic number.

161371769 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161371769 is a deficient number, since it is larger than the sum of its proper divisors (32325511).

161371769 is a wasteful number, since it uses less digits than its factorization.

161371769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38480.

The product of its digits is 47628, while the sum is 41.

The square root of 161371769 is about 12703.2188440568. The cubic root of 161371769 is about 544.4305912236.

The spelling of 161371769 in words is "one hundred sixty-one million, three hundred seventy-one thousand, seven hundred sixty-nine".