29561921 has 2 divisors, whose sum is σ = 29561922. Its totient is φ = 29561920.

The previous prime is 29561893. The next prime is 29561947. The reversal of 29561921 is 12916592.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27415696 + 2146225 = 5236^2 + 1465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29561921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (29561221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14780960 + 14780961.

It is an arithmetic number, because the mean of its divisors is an integer number (14780961).

Almost surely, 2^29561921 is an apocalyptic number.

It is an amenable number.

29561921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29561921 is an equidigital number, since it uses as much as digits as its factorization.

29561921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 29561921 is about 5437.0875475754. The cubic root of 29561921 is about 309.2033690885.

The spelling of 29561921 in words is "twenty-nine million, five hundred sixty-one thousand, nine hundred twenty-one".