181429997 has 12 divisors (see below), whose sum is σ = 211273920. Its totient is φ = 155347416.

The previous prime is 181429979. The next prime is 181430017. The reversal of 181429997 is 799924181.

It is not a de Polignac number, because 181429997 - 2¹⁸ = 181167853 is a prime.

It is a super-2 number, since 2×181429997² = 65833687622840018, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181429097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78188 + ... + 80474.

It is an arithmetic number, because the mean of its divisors is an integer number (17606160).

Almost surely, 2^181429997 is an apocalyptic number.

It is an amenable number.

181429997 is a deficient number, since it is larger than the sum of its proper divisors (29843923).

181429997 is a wasteful number, since it uses less digits than its factorization.

181429997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920 (or 3913 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The square root of 181429997 is about 13469.5952797402. The cubic root of 181429997 is about 566.1128737667.

The spelling of 181429997 in words is "one hundred eighty-one million, four hundred twenty-nine thousand, nine hundred ninety-seven".