29812981 has 16 divisors (see below), whose sum is σ = 33331968. Its totient is φ = 26438400.

The previous prime is 29812969. The next prime is 29812997. The reversal of 29812981 is 18921892.

It is a cyclic number.

It is not a de Polignac number, because 29812981 - 2⁵ = 29812949 is a prime.

It is a super-2 number, since 2×29812981² = 1777627672212722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29812901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109876 + ... + 110146.

It is an arithmetic number, because the mean of its divisors is an integer number (2083248).

Almost surely, 2^29812981 is an apocalyptic number.

It is an amenable number.

29812981 is a deficient number, since it is larger than the sum of its proper divisors (3518987).

29812981 is a wasteful number, since it uses less digits than its factorization.

29812981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 20736, while the sum is 40.

The square root of 29812981 is about 5460.1264637369. The cubic root of 29812981 is about 310.0762247522.

The spelling of 29812981 in words is "twenty-nine million, eight hundred twelve thousand, nine hundred eighty-one".