531211145 has 8 divisors (see below), whose sum is σ = 646186056. Its totient is φ = 419147136.

The previous prime is 531211117. The next prime is 531211147. The reversal of 531211145 is 541112135.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 531210304 = 29^2 + 23048^2 .

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 531211145 - 2⁶ = 531211081 is a prime.

It is a super-2 number, since 2×531211145² = 564370561144422050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531211145.

It is not an unprimeable number, because it can be changed into a prime (531211147) 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, 727322 + ... + 728051.

It is an arithmetic number, because the mean of its divisors is an integer number (80773257).

Almost surely, 2^531211145 is an apocalyptic number.

It is an amenable number.

531211145 is a deficient number, since it is larger than the sum of its proper divisors (114974911).

531211145 is a wasteful number, since it uses less digits than its factorization.

531211145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455451.

The product of its digits is 600, while the sum is 23.

The square root of 531211145 is about 23048.0182445259. The cubic root of 531211145 is about 809.8832047217.

The spelling of 531211145 in words is "five hundred thirty-one million, two hundred eleven thousand, one hundred forty-five".