161555107 has 6 divisors (see below), whose sum is σ = 187931508. Its totient is φ = 138475764.

The previous prime is 161555099. The next prime is 161555111. The reversal of 161555107 is 701555161.

It is not a de Polignac number, because 161555107 - 2³ = 161555099 is a prime.

It is a super-2 number, since 2×161555107² = 52200105195562898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161555117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1648473 + ... + 1648570.

It is an arithmetic number, because the mean of its divisors is an integer number (31321918).

Almost surely, 2^161555107 is an apocalyptic number.

161555107 is a deficient number, since it is larger than the sum of its proper divisors (26376401).

161555107 is an equidigital number, since it uses as much as digits as its factorization.

161555107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297057 (or 3297050 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 31.

The square root of 161555107 is about 12710.4329981319. The cubic root of 161555107 is about 544.6366930293.

The spelling of 161555107 in words is "one hundred sixty-one million, five hundred fifty-five thousand, one hundred seven".