1281975523 has 2 divisors, whose sum is σ = 1281975524. Its totient is φ = 1281975522.

The previous prime is 1281975473. The next prime is 1281975533. The reversal of 1281975523 is 3255791821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281975523 is a prime.

It is a super-2 number, since 2×1281975523² = 3286922483142247058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1281975523.

It is not a weakly prime, because it can be changed into another prime (1281975533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640987761 + 640987762.

It is an arithmetic number, because the mean of its divisors is an integer number (640987762).

Almost surely, 2^1281975523 is an apocalyptic number.

1281975523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281975523 is an equidigital number, since it uses as much as digits as its factorization.

1281975523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 1281975523 is about 35804.6857687650. The cubic root of 1281975523 is about 1086.3253422696.

The spelling of 1281975523 in words is "one billion, two hundred eighty-one million, nine hundred seventy-five thousand, five hundred twenty-three".