1309064898557 has 4 divisors (see below), whose sum is σ = 1409762198460. Its totient is φ = 1208367598656.

The previous prime is 1309064898523. The next prime is 1309064898587. The reversal of 1309064898557 is 7558984609031.

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 553158112516 + 755906786041 = 743746^2 + 869429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309064898557 - 2⁸ = 1309064898301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1309064898493 and 1309064898502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309064898587) 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, 50348649932 + ... + 50348649957.

It is an arithmetic number, because the mean of its divisors is an integer number (352440549615).

Almost surely, 2^{1309064898557} is an apocalyptic number.

It is an amenable number.

1309064898557 is a deficient number, since it is larger than the sum of its proper divisors (100697299903).

1309064898557 is a wasteful number, since it uses less digits than its factorization.

1309064898557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100697299902.

The product of its (nonzero) digits is 65318400, while the sum is 65.

The spelling of 1309064898557 in words is "one trillion, three hundred nine billion, sixty-four million, eight hundred ninety-eight thousand, five hundred fifty-seven".