161029290 has 32 divisors (see below), whose sum is σ = 393024960. Its totient is φ = 42212864.

The previous prime is 161029289. The next prime is 161029303. The reversal of 161029290 is 92920161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43719 + ... + 47258.

It is an arithmetic number, because the mean of its divisors is an integer number (12282030).

Almost surely, 2^161029290 is an apocalyptic number.

161029290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161029290 is an abundant number, since it is smaller than the sum of its proper divisors (231995670).

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

161029290 is a wasteful number, since it uses less digits than its factorization.

161029290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91046.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 161029290 is about 12689.7316756502. The cubic root of 161029290 is about 544.0451704310.

The spelling of 161029290 in words is "one hundred sixty-one million, twenty-nine thousand, two hundred ninety".