1172006561 has 16 divisors (see below), whose sum is σ = 1370210688. Its totient is φ = 991584000.

The previous prime is 1172006519. The next prime is 1172006567. The reversal of 1172006561 is 1656002711.

It is not a de Polignac number, because 1172006561 - 2⁶ = 1172006497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1172006567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53240 + ... + 71961.

It is an arithmetic number, because the mean of its divisors is an integer number (85638168).

Almost surely, 2^1172006561 is an apocalyptic number.

1172006561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1172006561 is a deficient number, since it is larger than the sum of its proper divisors (198204127).

1172006561 is a wasteful number, since it uses less digits than its factorization.

1172006561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125272.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1172006561 is about 34234.5813615414. The cubic root of 1172006561 is about 1054.3302836068.

The spelling of 1172006561 in words is "one billion, one hundred seventy-two million, six thousand, five hundred sixty-one".