531000061 has 8 divisors (see below), whose sum is σ = 558654264. Its totient is φ = 504046080.

The previous prime is 531000013. The next prime is 531000079. The reversal of 531000061 is 160000135.

It can be written as a sum of positive squares in 4 ways, for example, as 60543961 + 470456100 = 7781^2 + 21690^2 .

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-531000061 is a prime.

It is a super-2 number, since 2×531000061² = 563922129564007442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 530999999 and 531000044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531000161) 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, 173500 + ... + 176533.

It is an arithmetic number, because the mean of its divisors is an integer number (69831783).

Almost surely, 2^531000061 is an apocalyptic number.

It is an amenable number.

531000061 is a deficient number, since it is larger than the sum of its proper divisors (27654203).

531000061 is a wasteful number, since it uses less digits than its factorization.

531000061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350111.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 531000061 is about 23043.4385671930. The cubic root of 531000061 is about 809.7759177941.

Adding to 531000061 its reverse (160000135), we get a palindrome (691000196).

The spelling of 531000061 in words is "five hundred thirty-one million, sixty-one", and thus it is an aban number.