161771387 has 6 divisors (see below), whose sum is σ = 162833148. Its totient is φ = 160716504.

The previous prime is 161771383. The next prime is 161771413. The reversal of 161771387 is 783177161.

It is not a de Polignac number, because 161771387 - 2² = 161771383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161771383) 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 5 ways as a sum of consecutive naturals, for example, 21368 + ... + 27930.

It is an arithmetic number, because the mean of its divisors is an integer number (27138858).

Almost surely, 2^161771387 is an apocalyptic number.

161771387 is a deficient number, since it is larger than the sum of its proper divisors (1061761).

161771387 is an frugal number, since it uses more digits than its factorization.

161771387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877 (or 6720 counting only the distinct ones).

The product of its digits is 49392, while the sum is 41.

The square root of 161771387 is about 12718.9381239158. The cubic root of 161771387 is about 544.8796266431.

The spelling of 161771387 in words is "one hundred sixty-one million, seven hundred seventy-one thousand, three hundred eighty-seven".