1170405913609 has 3 divisors (see below), whose sum is σ = 1170406995463. Its totient is φ = 1170404831756.

The previous prime is 1170405913549. The next prime is 1170405913613. The reversal of 1170405913609 is 9063195040711.

The square root of 1170405913609 is 1081853.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 828382124025 + 342023789584 = 910155^2 + 584828^2 .

It is not a de Polignac number, because 1170405913609 - 2⁹ = 1170405913097 is a prime.

It is a super-2 number, since 2×1170405913609² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1170405914609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 540927 + ... + 1622779.

Almost surely, 2^{1170405913609} is an apocalyptic number.

1170405913609 is the 1081853-rd square number.

1170405913609 is the 540927-th centered octagonal number.

It is an amenable number.

1170405913609 is a deficient number, since it is larger than the sum of its proper divisors (1081854).

1170405913609 is an frugal number, since it uses more digits than its factorization.

1170405913609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163706 (or 1081853 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 1170405913609 in words is "one trillion, one hundred seventy billion, four hundred five million, nine hundred thirteen thousand, six hundred nine".