161929870 has 16 divisors (see below), whose sum is σ = 291872448. Its totient is φ = 64683360.

The previous prime is 161929861. The next prime is 161929877. The reversal of 161929870 is 78929161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161929877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3126 + ... + 18265.

It is an arithmetic number, because the mean of its divisors is an integer number (18242028).

Almost surely, 2^161929870 is an apocalyptic number.

161929870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161929870 is a deficient number, since it is larger than the sum of its proper divisors (129942578).

161929870 is a wasteful number, since it uses less digits than its factorization.

161929870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22155.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 161929870 is about 12725.1667965493. The cubic root of 161929870 is about 545.0575031210.

It can be divided in two parts, 16192 and 9870, that added together give a palindrome (26062).

The spelling of 161929870 in words is "one hundred sixty-one million, nine hundred twenty-nine thousand, eight hundred seventy".