2156520049 has 2 divisors, whose sum is σ = 2156520050. Its totient is φ = 2156520048.

The previous prime is 2156520029. The next prime is 2156520077. The reversal of 2156520049 is 9400256512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2139710049 + 16810000 = 46257^2 + 4100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156520049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2156519996 and 2156520023.

It is not a weakly prime, because it can be changed into another prime (2156520019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078260024 + 1078260025.

It is an arithmetic number, because the mean of its divisors is an integer number (1078260025).

Almost surely, 2^2156520049 is an apocalyptic number.

It is an amenable number.

2156520049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156520049 is an equidigital number, since it uses as much as digits as its factorization.

2156520049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2156520049 is about 46438.3467513649. The cubic root of 2156520049 is about 1291.9662439222.

It can be divided in two parts, 21565 and 20049, that added together give a palindrome (41614).

The spelling of 2156520049 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, forty-nine".