531297729 has 12 divisors (see below), whose sum is σ = 783758976. Its totient is φ = 346662072.

The previous prime is 531297671. The next prime is 531297737. The reversal of 531297729 is 927792135.

531297729 is a `hidden beast` number, since 531 + 2 + 97 + 7 + 29 = 666.

It is not a de Polignac number, because 531297729 - 2⁷ = 531297601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (531297749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627589 + ... + 628434.

It is an arithmetic number, because the mean of its divisors is an integer number (65313248).

Almost surely, 2^531297729 is an apocalyptic number.

It is an amenable number.

531297729 is a deficient number, since it is larger than the sum of its proper divisors (252461247).

531297729 is a wasteful number, since it uses less digits than its factorization.

531297729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256076 (or 1256073 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 531297729 is about 23049.8965073599. The cubic root of 531297729 is about 809.9272042490.

It can be divided in two parts, 5312 and 97729, that added together give a square (103041 = 321²).

The spelling of 531297729 in words is "five hundred thirty-one million, two hundred ninety-seven thousand, seven hundred twenty-nine".