29993981 has 2 divisors, whose sum is σ = 29993982. Its totient is φ = 29993980.

The previous prime is 29993969. The next prime is 29994017. The reversal of 29993981 is 18939992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 1585081 = 5330^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 29993981 - 2¹⁰ = 29992957 is a prime.

It is a super-2 number, since 2×29993981² = 1799277792456722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29993921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14996990 + 14996991.

It is an arithmetic number, because the mean of its divisors is an integer number (14996991).

Almost surely, 2^29993981 is an apocalyptic number.

It is an amenable number.

29993981 is a deficient number, since it is larger than the sum of its proper divisors (1).

29993981 is an equidigital number, since it uses as much as digits as its factorization.

29993981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 50.

The square root of 29993981 is about 5476.6760904768. The cubic root of 29993981 is about 310.7024687250.

The spelling of 29993981 in words is "twenty-nine million, nine hundred ninety-three thousand, nine hundred eighty-one".