1290212605897 has 4 divisors (see below), whose sum is σ = 1290227419780. Its totient is φ = 1290197792016.

The previous prime is 1290212605789. The next prime is 1290212605909. The reversal of 1290212605897 is 7985062120921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1249608743881 + 40603862016 = 1117859^2 + 201504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290212605897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290212605697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7275522 + ... + 7450747.

It is an arithmetic number, because the mean of its divisors is an integer number (322556854945).

Almost surely, 2^{1290212605897} is an apocalyptic number.

It is an amenable number.

1290212605897 is a deficient number, since it is larger than the sum of its proper divisors (14813883).

1290212605897 is an equidigital number, since it uses as much as digits as its factorization.

1290212605897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14813882.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 1290212605897 in words is "one trillion, two hundred ninety billion, two hundred twelve million, six hundred five thousand, eight hundred ninety-seven".