161427861 has 12 divisors (see below), whose sum is σ = 266484192. Its totient is φ = 92244456.

The previous prime is 161427859. The next prime is 161427863. The reversal of 161427861 is 168724161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161427859) and next prime (161427863).

It is not a de Polignac number, because 161427861 - 2¹ = 161427859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161427863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1281111 + ... + 1281236.

It is an arithmetic number, because the mean of its divisors is an integer number (22207016).

Almost surely, 2^161427861 is an apocalyptic number.

It is an amenable number.

161427861 is a deficient number, since it is larger than the sum of its proper divisors (105056331).

161427861 is a wasteful number, since it uses less digits than its factorization.

161427861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562360 (or 2562357 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 161427861 is about 12705.4264391243. The cubic root of 161427861 is about 544.4936643441.

The spelling of 161427861 in words is "one hundred sixty-one million, four hundred twenty-seven thousand, eight hundred sixty-one".