161387882 has 4 divisors (see below), whose sum is σ = 242081826. Its totient is φ = 80693940.

The previous prime is 161387873. The next prime is 161387903. The reversal of 161387882 is 288783161.

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

It can be written as a sum of positive squares in only one way, i.e., 116618401 + 44769481 = 10799^2 + 6691^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40346969 + ... + 40346972.

Almost surely, 2^161387882 is an apocalyptic number.

161387882 is a deficient number, since it is larger than the sum of its proper divisors (80693944).

161387882 is an equidigital number, since it uses as much as digits as its factorization.

161387882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80693943.

The product of its digits is 129024, while the sum is 44.

The square root of 161387882 is about 12703.8530375631. The cubic root of 161387882 is about 544.4487111178.

The spelling of 161387882 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, eight hundred eighty-two".