1861012769 has 16 divisors (see below), whose sum is σ = 2343206016. Its totient is φ = 1435776000.

The previous prime is 1861012757. The next prime is 1861012771. The reversal of 1861012769 is 9672101681.

It is a cyclic number.

It is not a de Polignac number, because 1861012769 - 2⁴ = 1861012753 is a prime.

It is a super-2 number, since 2×1861012769² = 6926737052762094722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861012709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111872 + ... + 127425.

It is an arithmetic number, because the mean of its divisors is an integer number (146450376).

Almost surely, 2^1861012769 is an apocalyptic number.

It is an amenable number.

1861012769 is a deficient number, since it is larger than the sum of its proper divisors (482193247).

1861012769 is a wasteful number, since it uses less digits than its factorization.

1861012769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239416.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1861012769 is about 43139.4572172622. The cubic root of 1861012769 is about 1230.0321160671.

The spelling of 1861012769 in words is "one billion, eight hundred sixty-one million, twelve thousand, seven hundred sixty-nine".