1025621239 has 2 divisors, whose sum is σ = 1025621240. Its totient is φ = 1025621238.

The previous prime is 1025621231. The next prime is 1025621297. The reversal of 1025621239 is 9321265201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1025621239 - 2³ = 1025621231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1025621239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025621231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512810619 + 512810620.

It is an arithmetic number, because the mean of its divisors is an integer number (512810620).

Almost surely, 2^1025621239 is an apocalyptic number.

1025621239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025621239 is an equidigital number, since it uses as much as digits as its factorization.

1025621239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1025621239 is about 32025.3218406935. The cubic root of 1025621239 is about 1008.4684951494.

The spelling of 1025621239 in words is "one billion, twenty-five million, six hundred twenty-one thousand, two hundred thirty-nine".