531212180261 has 16 divisors (see below), whose sum is σ = 624603701760. Its totient is φ = 442239937920.

The previous prime is 531212180209. The next prime is 531212180263. The reversal of 531212180261 is 162081212135.

It is a cyclic number.

It is not a de Polignac number, because 531212180261 - 2¹⁸ = 531211918117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531212180263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1654925 + ... + 1949666.

It is an arithmetic number, because the mean of its divisors is an integer number (39037731360).

Almost surely, 2^531212180261 is an apocalyptic number.

It is an amenable number.

531212180261 is a deficient number, since it is larger than the sum of its proper divisors (93391521499).

531212180261 is a wasteful number, since it uses less digits than its factorization.

531212180261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605204.

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 531212180261 its reverse (162081212135), we get a palindrome (693293392396).

The spelling of 531212180261 in words is "five hundred thirty-one billion, two hundred twelve million, one hundred eighty thousand, two hundred sixty-one".