20151815029 has 2 divisors, whose sum is σ = 20151815030. Its totient is φ = 20151815028.

The previous prime is 20151815027. The next prime is 20151815119. The reversal of 20151815029 is 92051815102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14676111025 + 5475704004 = 121145^2 + 73998^2 .

It is a cyclic number.

It is not a de Polignac number, because 20151815029 - 2¹ = 20151815027 is a prime.

Together with 20151815027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20151814985 and 20151815003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20151815027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075907514 + 10075907515.

It is an arithmetic number, because the mean of its divisors is an integer number (10075907515).

Almost surely, 2^20151815029 is an apocalyptic number.

It is an amenable number.

20151815029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20151815029 is an equidigital number, since it uses as much as digits as its factorization.

20151815029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 34.

The spelling of 20151815029 in words is "twenty billion, one hundred fifty-one million, eight hundred fifteen thousand, twenty-nine".