861490143 has 12 divisors (see below), whose sum is σ = 1267854120. Its totient is φ = 563490096.

The previous prime is 861490141. The next prime is 861490151. The reversal of 861490143 is 341094168.

It is not a de Polignac number, because 861490143 - 2¹ = 861490141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861490098 and 861490107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861490141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 902553 + ... + 903506.

It is an arithmetic number, because the mean of its divisors is an integer number (105654510).

Almost surely, 2^861490143 is an apocalyptic number.

861490143 is a deficient number, since it is larger than the sum of its proper divisors (406363977).

861490143 is a wasteful number, since it uses less digits than its factorization.

861490143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806118 (or 1806115 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 861490143 is about 29351.1523283158. The cubic root of 861490143 is about 951.5174798457.

The spelling of 861490143 in words is "eight hundred sixty-one million, four hundred ninety thousand, one hundred forty-three".