1265402543 has 2 divisors, whose sum is σ = 1265402544. Its totient is φ = 1265402542.

The previous prime is 1265402533. The next prime is 1265402549. The reversal of 1265402543 is 3452045621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265402543 - 2¹⁰ = 1265401519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265402549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632701271 + 632701272.

It is an arithmetic number, because the mean of its divisors is an integer number (632701272).

Almost surely, 2^1265402543 is an apocalyptic number.

1265402543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265402543 is an equidigital number, since it uses as much as digits as its factorization.

1265402543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 1265402543 is about 35572.4970026002. The cubic root of 1265402543 is about 1081.6237985084.

The spelling of 1265402543 in words is "one billion, two hundred sixty-five million, four hundred two thousand, five hundred forty-three".