531240451768321 has 4 divisors (see below), whose sum is σ = 562489890107652. Its totient is φ = 499991013428992.

The previous prime is 531240451768283. The next prime is 531240451768357. The reversal of 531240451768321 is 123867154042135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391115489689600 + 140124962078721 = 19776640^2 + 11837439^2 .

It is a cyclic number.

It is not a de Polignac number, because 531240451768321 - 2²³ = 531240443379713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531240451765321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15624719169640 + ... + 15624719169673.

It is an arithmetic number, because the mean of its divisors is an integer number (140622472526913).

Almost surely, 2^{531240451768321} is an apocalyptic number.

It is an amenable number.

531240451768321 is a deficient number, since it is larger than the sum of its proper divisors (31249438339331).

531240451768321 is a wasteful number, since it uses less digits than its factorization.

531240451768321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31249438339330.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The spelling of 531240451768321 in words is "five hundred thirty-one trillion, two hundred forty billion, four hundred fifty-one million, seven hundred sixty-eight thousand, three hundred twenty-one".