2156520029 has 2 divisors, whose sum is σ = 2156520030. Its totient is φ = 2156520028.

The previous prime is 2156520019. The next prime is 2156520049. The reversal of 2156520029 is 9200256512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1527011929 + 629508100 = 39077^2 + 25090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156520029 - 2²⁰ = 2155471453 is a prime.

It is a super-5 number, since 5×2156520029⁵ (a number of 48 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2156519977 and 2156520004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156520019) 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, 1078260014 + 1078260015.

It is an arithmetic number, because the mean of its divisors is an integer number (1078260015).

Almost surely, 2^2156520029 is an apocalyptic number.

It is an amenable number.

2156520029 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156520029 is an equidigital number, since it uses as much as digits as its factorization.

2156520029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2156520029 is about 46438.3465360256. The cubic root of 2156520029 is about 1291.9662399282.

The spelling of 2156520029 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, twenty-nine".