29393981 has 2 divisors, whose sum is σ = 29393982. Its totient is φ = 29393980.

The previous prime is 29393951. The next prime is 29393999. The reversal of 29393981 is 18939392.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 6916900 = 4741^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 29393981 - 2¹⁴ = 29377597 is a prime.

It is a super-2 number, since 2×29393981² = 1728012238056722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29393951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14696990 + 14696991.

It is an arithmetic number, because the mean of its divisors is an integer number (14696991).

Almost surely, 2^29393981 is an apocalyptic number.

It is an amenable number.

29393981 is a deficient number, since it is larger than the sum of its proper divisors (1).

29393981 is an equidigital number, since it uses as much as digits as its factorization.

29393981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 29393981 is about 5421.6216208806. The cubic root of 29393981 is about 308.6167331233.

The spelling of 29393981 in words is "twenty-nine million, three hundred ninety-three thousand, nine hundred eighty-one".