872011531 has 4 divisors (see below), whose sum is σ = 886306864. Its totient is φ = 857716200.

The previous prime is 872011519. The next prime is 872011573. The reversal of 872011531 is 135110278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135110278 = 2 ⋅67555139.

It is a cyclic number.

It is not a de Polignac number, because 872011531 - 2¹⁵ = 871978763 is a prime.

It is a super-2 number, since 2×872011531² = 1520808220393927922, which contains 22 as substring.

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 872011531.

It is not an unprimeable number, because it can be changed into a prime (872011501) 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 3 ways as a sum of consecutive naturals, for example, 7147575 + ... + 7147696.

It is an arithmetic number, because the mean of its divisors is an integer number (221576716).

Almost surely, 2^872011531 is an apocalyptic number.

872011531 is a deficient number, since it is larger than the sum of its proper divisors (14295333).

872011531 is a wasteful number, since it uses less digits than its factorization.

872011531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14295332.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 872011531 is about 29529.8413642878. The cubic root of 872011531 is about 955.3754473451.

The spelling of 872011531 in words is "eight hundred seventy-two million, eleven thousand, five hundred thirty-one".