29688521 has 2 divisors, whose sum is σ = 29688522. Its totient is φ = 29688520.

The previous prime is 29688497. The next prime is 29688523. The reversal of 29688521 is 12588692.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29278921 + 409600 = 5411^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 29688521 - 2¹⁸ = 29426377 is a prime.

Together with 29688523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (29688523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14844260 + 14844261.

It is an arithmetic number, because the mean of its divisors is an integer number (14844261).

Almost surely, 2^29688521 is an apocalyptic number.

It is an amenable number.

29688521 is a deficient number, since it is larger than the sum of its proper divisors (1).

29688521 is an equidigital number, since it uses as much as digits as its factorization.

29688521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 29688521 is about 5448.7173720060. The cubic root of 29688521 is about 309.6441320430.

The spelling of 29688521 in words is "twenty-nine million, six hundred eighty-eight thousand, five hundred twenty-one".