1025263639 has 2 divisors, whose sum is σ = 1025263640. Its totient is φ = 1025263638.

The previous prime is 1025263627. The next prime is 1025263667. The reversal of 1025263639 is 9363625201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1025263639 - 2²³ = 1016875031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1025263598 and 1025263607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025263699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512631819 + 512631820.

It is an arithmetic number, because the mean of its divisors is an integer number (512631820).

Almost surely, 2^1025263639 is an apocalyptic number.

1025263639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025263639 is an equidigital number, since it uses as much as digits as its factorization.

1025263639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 1025263639 is about 32019.7382718847. The cubic root of 1025263639 is about 1008.3512750551.

The spelling of 1025263639 in words is "one billion, twenty-five million, two hundred sixty-three thousand, six hundred thirty-nine".