531000399 has 8 divisors (see below), whose sum is σ = 709039872. Its totient is φ = 353480600.

The previous prime is 531000397. The next prime is 531000403. The reversal of 531000399 is 993000135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 531000399 - 2¹ = 531000397 is a prime.

It is a super-2 number, since 2×531000399² = 563922847476318402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531000397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127527 + ... + 131624.

It is an arithmetic number, because the mean of its divisors is an integer number (88629984).

Almost surely, 2^531000399 is an apocalyptic number.

531000399 is a deficient number, since it is larger than the sum of its proper divisors (178039473).

531000399 is a wasteful number, since it uses less digits than its factorization.

531000399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259837.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 531000399 is about 23043.4459011668. The cubic root of 531000399 is about 809.7760896109.

The spelling of 531000399 in words is "five hundred thirty-one million, three hundred ninety-nine", and thus it is an aban number.