531397 has 4 divisors (see below), whose sum is σ = 535360. Its totient is φ = 527436.

The previous prime is 531383. The next prime is 531457. The reversal of 531397 is 793135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531397 - 2¹¹ = 529349 is a prime.

It is a Duffinian number.

531397 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531337) 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, 1773 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (133840).

531397 is a Friedman number, since it can be written as 9^(3+3)-51+7, using all its digits and the basic arithmetic operations.

2⁵³¹³⁹⁷ is an apocalyptic number.

It is an amenable number.

531397 is a deficient number, since it is larger than the sum of its proper divisors (3963).

531397 is a wasteful number, since it uses less digits than its factorization.

531397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962.

The product of its digits is 2835, while the sum is 28.

The square root of 531397 is about 728.9698210489. The cubic root of 531397 is about 80.9977645067.

The spelling of 531397 in words is "five hundred thirty-one thousand, three hundred ninety-seven".