1866191241 has 16 divisors (see below), whose sum is σ = 2515114368. Its totient is φ = 1230720000.

The previous prime is 1866191221. The next prime is 1866191251. The reversal of 1866191241 is 1421916681.

It is not a de Polignac number, because 1866191241 - 2⁷ = 1866191113 is a prime.

It is a super-3 number, since 3×1866191241³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1866191241.

It is not an unprimeable number, because it can be changed into a prime (1866191221) 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, 483180 + ... + 487026.

It is an arithmetic number, because the mean of its divisors is an integer number (157194648).

Almost surely, 2^1866191241 is an apocalyptic number.

It is an amenable number.

1866191241 is a deficient number, since it is larger than the sum of its proper divisors (648923127).

1866191241 is a wasteful number, since it uses less digits than its factorization.

1866191241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5552.

The product of its digits is 20736, while the sum is 39.

The square root of 1866191241 is about 43199.4356560361. The cubic root of 1866191241 is about 1231.1719591994.

The spelling of 1866191241 in words is "one billion, eight hundred sixty-six million, one hundred ninety-one thousand, two hundred forty-one".