29331981 has 12 divisors (see below), whose sum is σ = 48421152. Its totient is φ = 16761096.

The previous prime is 29331979. The next prime is 29332049. The reversal of 29331981 is 18913392.

It is not a de Polignac number, because 29331981 - 2¹ = 29331979 is a prime.

It is a super-2 number, since 2×29331981² = 1720730218768722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29331931) 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, 232731 + ... + 232856.

It is an arithmetic number, because the mean of its divisors is an integer number (4035096).

Almost surely, 2^29331981 is an apocalyptic number.

29331981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29331981 is a deficient number, since it is larger than the sum of its proper divisors (19089171).

29331981 is a wasteful number, since it uses less digits than its factorization.

29331981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465600 (or 465597 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 29331981 is about 5415.9007561070. The cubic root of 29331981 is about 308.3995944924.

The spelling of 29331981 in words is "twenty-nine million, three hundred thirty-one thousand, nine hundred eighty-one".