531379721 has 8 divisors (see below), whose sum is σ = 547951488. Its totient is φ = 514980000.

The previous prime is 531379699. The next prime is 531379729. The reversal of 531379721 is 127973135.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531379721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531379729) 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, 36725 + ... + 49106.

It is an arithmetic number, because the mean of its divisors is an integer number (68493936).

Almost surely, 2^531379721 is an apocalyptic number.

It is an amenable number.

531379721 is a deficient number, since it is larger than the sum of its proper divisors (16571767).

531379721 is a wasteful number, since it uses less digits than its factorization.

531379721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86023.

The product of its digits is 39690, while the sum is 38.

The square root of 531379721 is about 23051.6750150613. The cubic root of 531379721 is about 809.9688658459.

The spelling of 531379721 in words is "five hundred thirty-one million, three hundred seventy-nine thousand, seven hundred twenty-one".