531054320731551 has 20 divisors (see below), whose sum is σ = 793366485397200. Its totient is φ = 354008045729376.

The previous prime is 531054320731531. The next prime is 531054320731603. The reversal of 531054320731551 is 155137023450135.

531054320731551 is a `hidden beast` number, since 5 + 3 + 1 + 0 + 5 + 4 + 3 + 20 + 73 + 1 + 551 = 666.

It is not a de Polignac number, because 531054320731551 - 2³¹ = 531052173247903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531054320731497 and 531054320731506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531054320731531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 259791291 + ... + 261827468.

It is an arithmetic number, because the mean of its divisors is an integer number (39668324269860).

Almost surely, 2^{531054320731551} is an apocalyptic number.

531054320731551 is a deficient number, since it is larger than the sum of its proper divisors (262312164665649).

531054320731551 is a wasteful number, since it uses less digits than its factorization.

531054320731551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521631340 (or 521631331 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

The spelling of 531054320731551 in words is "five hundred thirty-one trillion, fifty-four billion, three hundred twenty million, seven hundred thirty-one thousand, five hundred fifty-one".