161877371 has 4 divisors (see below), whose sum is σ = 162134544. Its totient is φ = 161620200.

The previous prime is 161877341. The next prime is 161877379. The reversal of 161877371 is 173778161.

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

It is a cyclic number.

It is not a de Polignac number, because 161877371 - 2²² = 157683067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161877379) 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, 127640 + ... + 128901.

It is an arithmetic number, because the mean of its divisors is an integer number (40533636).

Almost surely, 2^161877371 is an apocalyptic number.

161877371 is a deficient number, since it is larger than the sum of its proper divisors (257173).

161877371 is an equidigital number, since it uses as much as digits as its factorization.

161877371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257172.

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

The square root of 161877371 is about 12723.1038272899. The cubic root of 161877371 is about 544.9985927074.

The spelling of 161877371 in words is "one hundred sixty-one million, eight hundred seventy-seven thousand, three hundred seventy-one".