2125031561 has 2 divisors, whose sum is σ = 2125031562. Its totient is φ = 2125031560.

The previous prime is 2125031537. The next prime is 2125031621. The reversal of 2125031561 is 1651305212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1594005625 + 531025936 = 39925^2 + 23044^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125031561 - 2¹⁴ = 2125015177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2125031561.

It is not a weakly prime, because it can be changed into another prime (2125031761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062515780 + 1062515781.

It is an arithmetic number, because the mean of its divisors is an integer number (1062515781).

Almost surely, 2^2125031561 is an apocalyptic number.

It is an amenable number.

2125031561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125031561 is an equidigital number, since it uses as much as digits as its factorization.

2125031561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2125031561 is about 46098.0646123023. The cubic root of 2125031561 is about 1285.6471601775.

Adding to 2125031561 its reverse (1651305212), we get a palindrome (3776336773).

The spelling of 2125031561 in words is "two billion, one hundred twenty-five million, thirty-one thousand, five hundred sixty-one".