1265992543 has 2 divisors, whose sum is σ = 1265992544. Its totient is φ = 1265992542.

The previous prime is 1265992531. The next prime is 1265992561. The reversal of 1265992543 is 3452995621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265992543 - 2¹³ = 1265984351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265992493 and 1265992502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265992513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632996271 + 632996272.

It is an arithmetic number, because the mean of its divisors is an integer number (632996272).

Almost surely, 2^1265992543 is an apocalyptic number.

1265992543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265992543 is an equidigital number, since it uses as much as digits as its factorization.

1265992543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 46.

The square root of 1265992543 is about 35580.7889597743. The cubic root of 1265992543 is about 1081.7918764819.

The spelling of 1265992543 in words is "one billion, two hundred sixty-five million, nine hundred ninety-two thousand, five hundred forty-three".