531481665 has 64 divisors (see below), whose sum is σ = 1007419392. Its totient is φ = 235872000.

The previous prime is 531481633. The next prime is 531481667. The reversal of 531481665 is 566184135.

It is not a de Polignac number, because 531481665 - 2⁵ = 531481633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (531481667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 271440 + ... + 273390.

It is an arithmetic number, because the mean of its divisors is an integer number (15740928).

Almost surely, 2^531481665 is an apocalyptic number.

531481665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

531481665 is a deficient number, since it is larger than the sum of its proper divisors (475937727).

531481665 is a wasteful number, since it uses less digits than its factorization.

531481665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110.

The product of its digits is 86400, while the sum is 39.

The square root of 531481665 is about 23053.8861149265. The cubic root of 531481665 is about 810.0206594334.

The spelling of 531481665 in words is "five hundred thirty-one million, four hundred eighty-one thousand, six hundred sixty-five".