2528978161 has 2 divisors, whose sum is σ = 2528978162. Its totient is φ = 2528978160.

The previous prime is 2528978159. The next prime is 2528978173. The reversal of 2528978161 is 1618798252.

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., 2493504225 + 35473936 = 49935^2 + 5956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528978161 - 2¹ = 2528978159 is a prime.

Together with 2528978159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2528978131) 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, 1264489080 + 1264489081.

It is an arithmetic number, because the mean of its divisors is an integer number (1264489081).

Almost surely, 2^2528978161 is an apocalyptic number.

It is an amenable number.

2528978161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528978161 is an equidigital number, since it uses as much as digits as its factorization.

2528978161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 2528978161 is about 50288.9467079994. The cubic root of 2528978161 is about 1362.4325985904.

The spelling of 2528978161 in words is "two billion, five hundred twenty-eight million, nine hundred seventy-eight thousand, one hundred sixty-one".