1172256605 has 8 divisors (see below), whose sum is σ = 1514916312. Its totient is φ = 865666368.

The previous prime is 1172256593. The next prime is 1172256611. The reversal of 1172256605 is 5066522711.

It can be written as a sum of positive squares in 4 ways, for example, as 71808676 + 1100447929 = 8474^2 + 33173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1172256605 - 2⁶ = 1172256541 is a prime.

It is a super-2 number, since 2×1172256605² = 2748371095932252050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9017294 + ... + 9017423.

It is an arithmetic number, because the mean of its divisors is an integer number (189364539).

Almost surely, 2^1172256605 is an apocalyptic number.

It is an amenable number.

1172256605 is a deficient number, since it is larger than the sum of its proper divisors (342659707).

1172256605 is a wasteful number, since it uses less digits than its factorization.

1172256605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18034735.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1172256605 is about 34238.2330881721. The cubic root of 1172256605 is about 1054.4052576511.

The spelling of 1172256605 in words is "one billion, one hundred seventy-two million, two hundred fifty-six thousand, six hundred five".