987172543 has 32 divisors (see below), whose sum is σ = 1196135424. Its totient is φ = 797029632.

The previous prime is 987172523. The next prime is 987172661. The reversal of 987172543 is 345271789.

It is not a de Polignac number, because 987172543 - 2¹³ = 987164351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 987172493 and 987172502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987172523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1525446 + ... + 1526092.

It is an arithmetic number, because the mean of its divisors is an integer number (37379232).

Almost surely, 2^987172543 is an apocalyptic number.

987172543 is a deficient number, since it is larger than the sum of its proper divisors (208962881).

987172543 is a wasteful number, since it uses less digits than its factorization.

987172543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its digits is 423360, while the sum is 46.

The square root of 987172543 is about 31419.3020769081. The cubic root of 987172543 is about 995.7057669584.

It can be divided in two parts, 987172 and 543, that added together give a triangular number (987715 = T₁₄₀₅).

The spelling of 987172543 in words is "nine hundred eighty-seven million, one hundred seventy-two thousand, five hundred forty-three".