531440999999 has 32 divisors (see below), whose sum is σ = 661593784320. Its totient is φ = 415653638400.

The previous prime is 531440999963. The next prime is 531441000061. The reversal of 531440999999 is 999999044135.

It is a Cunningham number, because it is equal to 90⁶-1.

It is a de Polignac number, because none of the positive numbers 2^k-531440999999 is a prime.

531440999999 is a modest number, since divided by 999999 gives 531440 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531440999939) 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, 64876994 + ... + 64885184.

It is an arithmetic number, because the mean of its divisors is an integer number (20674805760).

Almost surely, 2^531440999999 is an apocalyptic number.

531440999999 is a deficient number, since it is larger than the sum of its proper divisors (130152784321).

531440999999 is a wasteful number, since it uses less digits than its factorization.

531440999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16311.

The product of its (nonzero) digits is 127545840, while the sum is 71.

The spelling of 531440999999 in words is "five hundred thirty-one billion, four hundred forty million, nine hundred ninety-nine thousand, nine hundred ninety-nine".