1025643601 has 2 divisors, whose sum is σ = 1025643602. Its totient is φ = 1025643600.

The previous prime is 1025643599. The next prime is 1025643629. The reversal of 1025643601 is 1063465201.

It is an a-pointer prime, because the next prime (1025643629) can be obtained adding 1025643601 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 936360000 + 89283601 = 30600^2 + 9449^2 .

It is an emirp because it is prime and its reverse (1063465201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025643601 - 2¹ = 1025643599 is a prime.

Together with 1025643599, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1025643601.

It is not a weakly prime, because it can be changed into another prime (1025643631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512821800 + 512821801.

It is an arithmetic number, because the mean of its divisors is an integer number (512821801).

Almost surely, 2^1025643601 is an apocalyptic number.

It is an amenable number.

1025643601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025643601 is an equidigital number, since it uses as much as digits as its factorization.

1025643601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1025643601 is about 32025.6709687713. The cubic root of 1025643601 is about 1008.4758244336.

The spelling of 1025643601 in words is "one billion, twenty-five million, six hundred forty-three thousand, six hundred one".