1265432789 has 2 divisors, whose sum is σ = 1265432790. Its totient is φ = 1265432788.

The previous prime is 1265432743. The next prime is 1265432797. The reversal of 1265432789 is 9872345621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1105030564 + 160402225 = 33242^2 + 12665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265432789 - 2²⁰ = 1264384213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265431789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632716394 + 632716395.

It is an arithmetic number, because the mean of its divisors is an integer number (632716395).

Almost surely, 2^1265432789 is an apocalyptic number.

It is an amenable number.

1265432789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265432789 is an equidigital number, since it uses as much as digits as its factorization.

1265432789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 1265432789 is about 35572.9221318688. The cubic root of 1265432789 is about 1081.6324161963.

The spelling of 1265432789 in words is "one billion, two hundred sixty-five million, four hundred thirty-two thousand, seven hundred eighty-nine".