1861117853 has 6 divisors (see below), whose sum is σ = 2164973886. Its totient is φ = 1595243832.

The previous prime is 1861117807. The next prime is 1861117877. The reversal of 1861117853 is 3587111681.

It can be written as a sum of positive squares in only one way, i.e., 954686404 + 906431449 = 30898^2 + 30107^2 .

It is not a de Polignac number, because 1861117853 - 2⁸ = 1861117597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861117853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861116853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18990950 + ... + 18991047.

It is an arithmetic number, because the mean of its divisors is an integer number (360828981).

Almost surely, 2^1861117853 is an apocalyptic number.

It is an amenable number.

1861117853 is a deficient number, since it is larger than the sum of its proper divisors (303856033).

1861117853 is an equidigital number, since it uses as much as digits as its factorization.

1861117853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37982011 (or 37982004 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 1861117853 is about 43140.6751569792. The cubic root of 1861117853 is about 1230.0552673076.

The spelling of 1861117853 in words is "one billion, eight hundred sixty-one million, one hundred seventeen thousand, eight hundred fifty-three".