4172201861 has 4 divisors (see below), whose sum is σ = 4273962924. Its totient is φ = 4070440800.

The previous prime is 4172201851. The next prime is 4172201903. The reversal of 4172201861 is 1681022714.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1261599361 + 2910602500 = 35519^2 + 53950^2 .

It is a cyclic number.

It is not a de Polignac number, because 4172201861 - 2³⁰ = 3098460037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4172201851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50880470 + ... + 50880551.

It is an arithmetic number, because the mean of its divisors is an integer number (1068490731).

Almost surely, 2^4172201861 is an apocalyptic number.

4172201861 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4172201861 is a deficient number, since it is larger than the sum of its proper divisors (101761063).

4172201861 is a wasteful number, since it uses less digits than its factorization.

4172201861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101761062.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 4172201861 is about 64592.5836377521. The cubic root of 4172201861 is about 1609.8612152272.

The spelling of 4172201861 in words is "four billion, one hundred seventy-two million, two hundred one thousand, eight hundred sixty-one".