1025636749 has 2 divisors, whose sum is σ = 1025636750. Its totient is φ = 1025636748.

The previous prime is 1025636687. The next prime is 1025636779. The reversal of 1025636749 is 9476365201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 918514249 + 107122500 = 30307^2 + 10350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025636749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025636779) 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, 512818374 + 512818375.

It is an arithmetic number, because the mean of its divisors is an integer number (512818375).

Almost surely, 2^1025636749 is an apocalyptic number.

It is an amenable number.

1025636749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025636749 is an equidigital number, since it uses as much as digits as its factorization.

1025636749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 1025636749 is about 32025.5639919112. The cubic root of 1025636749 is about 1008.4735786594.

The spelling of 1025636749 in words is "one billion, twenty-five million, six hundred thirty-six thousand, seven hundred forty-nine".