161801934 has 16 divisors (see below), whose sum is σ = 369833088. Its totient is φ = 46229112.

The previous prime is 161801923. The next prime is 161801953. The reversal of 161801934 is 439108161.

It is a super-2 number, since 2×161801934² = 52359731692280712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161801895 and 161801904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1926172 + ... + 1926255.

It is an arithmetic number, because the mean of its divisors is an integer number (23114568).

Almost surely, 2^161801934 is an apocalyptic number.

161801934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161801934 is an abundant number, since it is smaller than the sum of its proper divisors (208031154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161801934 is a wasteful number, since it uses less digits than its factorization.

161801934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852439.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161801934 is about 12720.1389143358. The cubic root of 161801934 is about 544.9139206979.

It can be divided in two parts, 161801 and 934, that added together give a triangular number (162735 = T₅₇₀).

The spelling of 161801934 in words is "one hundred sixty-one million, eight hundred one thousand, nine hundred thirty-four".