872531081 has 4 divisors (see below), whose sum is σ = 875120532. Its totient is φ = 869941632.

The previous prime is 872531057. The next prime is 872531087. The reversal of 872531081 is 180135278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180135278 = 2 ⋅90067639.

It can be written as a sum of positive squares in 2 ways, for example, as 73960000 + 798571081 = 8600^2 + 28259^2 .

It is a cyclic number.

It is not a de Polignac number, because 872531081 - 2¹⁸ = 872268937 is a prime.

It is a super-2 number, since 2×872531081² = 1522620974622057122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872531087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294220 + ... + 1294893.

It is an arithmetic number, because the mean of its divisors is an integer number (218780133).

Almost surely, 2^872531081 is an apocalyptic number.

It is an amenable number.

872531081 is a deficient number, since it is larger than the sum of its proper divisors (2589451).

872531081 is a wasteful number, since it uses less digits than its factorization.

872531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589450.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 872531081 is about 29538.6370877195. The cubic root of 872531081 is about 955.5651492582.

The spelling of 872531081 in words is "eight hundred seventy-two million, five hundred thirty-one thousand, eighty-one".