29131621 has 2 divisors, whose sum is σ = 29131622. Its totient is φ = 29131620.

The previous prime is 29131603. The next prime is 29131637. The reversal of 29131621 is 12613192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 893025 = 5314^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 29131621 - 2²³ = 20743013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29131651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14565810 + 14565811.

It is an arithmetic number, because the mean of its divisors is an integer number (14565811).

Almost surely, 2^29131621 is an apocalyptic number.

It is an amenable number.

29131621 is a deficient number, since it is larger than the sum of its proper divisors (1).

29131621 is an equidigital number, since it uses as much as digits as its factorization.

29131621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 29131621 is about 5397.3716751767. The cubic root of 29131621 is about 307.6957873597.

The spelling of 29131621 in words is "twenty-nine million, one hundred thirty-one thousand, six hundred twenty-one".