1861746681 has 8 divisors (see below), whose sum is σ = 2486204064. Its totient is φ = 1239226880.

The previous prime is 1861746643. The next prime is 1861746683. The reversal of 1861746681 is 1866471681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1861746681 - 2⁶ = 1861746617 is a prime.

It is a super-2 number, since 2×1861746681² = 6932201408429031522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1861746681.

It is not an unprimeable number, because it can be changed into a prime (1861746683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482151 + ... + 485996.

It is an arithmetic number, because the mean of its divisors is an integer number (310775508).

Almost surely, 2^1861746681 is an apocalyptic number.

It is an amenable number.

1861746681 is a deficient number, since it is larger than the sum of its proper divisors (624457383).

1861746681 is an equidigital number, since it uses as much as digits as its factorization.

1861746681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968791.

The product of its digits is 387072, while the sum is 48.

The square root of 1861746681 is about 43147.9626517869. The cubic root of 1861746681 is about 1230.1937873004.

The spelling of 1861746681 in words is "one billion, eight hundred sixty-one million, seven hundred forty-six thousand, six hundred eighty-one".