29128621 has 2 divisors, whose sum is σ = 29128622. Its totient is φ = 29128620.

The previous prime is 29128613. The next prime is 29128651. The reversal of 29128621 is 12682192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 2975625 = 5114^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 29128621 - 2³ = 29128613 is a prime.

It is a super-2 number, since 2×29128621² = 1696953122723282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29128651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14564310 + 14564311.

It is an arithmetic number, because the mean of its divisors is an integer number (14564311).

Almost surely, 2^29128621 is an apocalyptic number.

It is an amenable number.

29128621 is a deficient number, since it is larger than the sum of its proper divisors (1).

29128621 is an equidigital number, since it uses as much as digits as its factorization.

29128621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 29128621 is about 5397.0937549759. The cubic root of 29128621 is about 307.6852247360.

The spelling of 29128621 in words is "twenty-nine million, one hundred twenty-eight thousand, six hundred twenty-one".