29891243 has 2 divisors, whose sum is σ = 29891244. Its totient is φ = 29891242.

The previous prime is 29891233. The next prime is 29891249. The reversal of 29891243 is 34219892.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29891243 - 2¹² = 29887147 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 29891197 and 29891206.

It is not a weakly prime, because it can be changed into another prime (29891249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14945621 + 14945622.

It is an arithmetic number, because the mean of its divisors is an integer number (14945622).

Almost surely, 2^29891243 is an apocalyptic number.

29891243 is a deficient number, since it is larger than the sum of its proper divisors (1).

29891243 is an equidigital number, since it uses as much as digits as its factorization.

29891243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 29891243 is about 5467.2884504112. The cubic root of 29891243 is about 310.3473145149.

The spelling of 29891243 in words is "twenty-nine million, eight hundred ninety-one thousand, two hundred forty-three".