11572861 has 2 divisors, whose sum is σ = 11572862. Its totient is φ = 11572860.

The previous prime is 11572853. The next prime is 11572867. The reversal of 11572861 is 16827511.

11572861 = 2405² + 2406².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5788836 + 5784025 = 2406^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 11572861 - 2³ = 11572853 is a prime.

It is a super-2 number, since 2×11572861² = 267862223450642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11572867) 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 as a sum of consecutive naturals, namely, 5786430 + 5786431.

It is an arithmetic number, because the mean of its divisors is an integer number (5786431).

Almost surely, 2^11572861 is an apocalyptic number.

11572861 is the 2406-th centered square number.

It is an amenable number.

11572861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11572861 is an equidigital number, since it uses as much as digits as its factorization.

11572861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 11572861 is about 3401.8907977770. The cubic root of 11572861 is about 226.1935650783.

The spelling of 11572861 in words is "eleven million, five hundred seventy-two thousand, eight hundred sixty-one".