29056721 has 2 divisors, whose sum is σ = 29056722. Its totient is φ = 29056720.

The previous prime is 29056697. The next prime is 29056747. The reversal of 29056721 is 12765092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27196225 + 1860496 = 5215^2 + 1364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29056721 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (29056771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14528360 + 14528361.

It is an arithmetic number, because the mean of its divisors is an integer number (14528361).

Almost surely, 2^29056721 is an apocalyptic number.

It is an amenable number.

29056721 is a deficient number, since it is larger than the sum of its proper divisors (1).

29056721 is an equidigital number, since it uses as much as digits as its factorization.

29056721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 29056721 is about 5390.4286471486. The cubic root of 29056721 is about 307.4318565815.

The spelling of 29056721 in words is "twenty-nine million, fifty-six thousand, seven hundred twenty-one".