81229190 has 32 divisors (see below), whose sum is σ = 167443200. Its totient is φ = 27792864.

The previous prime is 81229189. The next prime is 81229229. The reversal of 81229190 is 9192218.

It is a happy number.

It is a super-2 number, since 2×81229190² = 13196362616112200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46961 + ... + 48659.

It is an arithmetic number, because the mean of its divisors is an integer number (5232600).

Almost surely, 2^81229190 is an apocalyptic number.

81229190 is an abundant number, since it is smaller than the sum of its proper divisors (86214010).

81229190 is a wasteful number, since it uses less digits than its factorization.

81229190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 81229190 is about 9012.7237836295. The cubic root of 81229190 is about 433.0825722089.

The spelling of 81229190 in words is "eighty-one million, two hundred twenty-nine thousand, one hundred ninety".