1292705521 has 2 divisors, whose sum is σ = 1292705522. Its totient is φ = 1292705520.

The previous prime is 1292705507. The next prime is 1292705597. The reversal of 1292705521 is 1255072921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804516496 + 488189025 = 28364^2 + 22095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1292705521 - 2¹⁵ = 1292672753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1292705021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646352760 + 646352761.

It is an arithmetic number, because the mean of its divisors is an integer number (646352761).

Almost surely, 2^1292705521 is an apocalyptic number.

It is an amenable number.

1292705521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1292705521 is an equidigital number, since it uses as much as digits as its factorization.

1292705521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1292705521 is about 35954.2142314361. The cubic root of 1292705521 is about 1089.3477344935.

The spelling of 1292705521 in words is "one billion, two hundred ninety-two million, seven hundred five thousand, five hundred twenty-one".