531045039421 has 8 divisors (see below), whose sum is σ = 587351270744. Its totient is φ = 476946895680.

The previous prime is 531045039409. The next prime is 531045039431. The reversal of 531045039421 is 124930540135.

It can be written as a sum of positive squares in 4 ways, for example, as 96317122500 + 434727916921 = 310350^2 + 659339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531045039421 - 2⁵ = 531045039389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531045039431) 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, 552021390 + ... + 552022351.

It is an arithmetic number, because the mean of its divisors is an integer number (73418908843).

Almost surely, 2^531045039421 is an apocalyptic number.

It is an amenable number.

531045039421 is a deficient number, since it is larger than the sum of its proper divisors (56306231323).

531045039421 is a wasteful number, since it uses less digits than its factorization.

531045039421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104043791.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 531045039421 its reverse (124930540135), we get a palindrome (655975579556).

The spelling of 531045039421 in words is "five hundred thirty-one billion, forty-five million, thirty-nine thousand, four hundred twenty-one".