29981081 has 8 divisors (see below), whose sum is σ = 34186824. Its totient is φ = 26046720.

The previous prime is 29981071. The next prime is 29981087. The reversal of 29981081 is 18018992.

It can be written as a sum of positive squares in 4 ways, for example, as 648025 + 29333056 = 805^2 + 5416^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 29981081 - 2¹⁰ = 29980057 is a prime.

It is a super-2 number, since 2×29981081² = 1797730435857122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29981087) 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, 67610 + ... + 68051.

It is an arithmetic number, because the mean of its divisors is an integer number (4273353).

Almost surely, 2^29981081 is an apocalyptic number.

It is an amenable number.

29981081 is a deficient number, since it is larger than the sum of its proper divisors (4205743).

29981081 is a wasteful number, since it uses less digits than its factorization.

29981081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135691.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 29981081 is about 5475.4982421694. The cubic root of 29981081 is about 310.6579193804.

The spelling of 29981081 in words is "twenty-nine million, nine hundred eighty-one thousand, eighty-one".