861192001 has 16 divisors (see below), whose sum is σ = 923660496. Its totient is φ = 800106496.

The previous prime is 861191993. The next prime is 861192029. The reversal of 861192001 is 100291168.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 256032001 + 605160000 = 16001^2 + 24600^2 .

It is not a de Polignac number, because 861192001 - 2³ = 861191993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861192701) 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, 457875 + ... + 459751.

It is an arithmetic number, because the mean of its divisors is an integer number (57728781).

Almost surely, 2^861192001 is an apocalyptic number.

It is an amenable number.

861192001 is a deficient number, since it is larger than the sum of its proper divisors (62468495).

861192001 is a wasteful number, since it uses less digits than its factorization.

861192001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 861192001 is about 29346.0730081556. The cubic root of 861192001 is about 951.4077010479.

The spelling of 861192001 in words is "eight hundred sixty-one million, one hundred ninety-two thousand, one".