531401791 has 2 divisors, whose sum is σ = 531401792. Its totient is φ = 531401790.

The previous prime is 531401789. The next prime is 531401813. The reversal of 531401791 is 197104135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531401791 - 2¹ = 531401789 is a prime.

Together with 531401789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531401711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265700895 + 265700896.

It is an arithmetic number, because the mean of its divisors is an integer number (265700896).

Almost surely, 2^531401791 is an apocalyptic number.

531401791 is a deficient number, since it is larger than the sum of its proper divisors (1).

531401791 is an equidigital number, since it uses as much as digits as its factorization.

531401791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 531401791 is about 23052.1537171692. The cubic root of 531401791 is about 809.9800792743.

The spelling of 531401791 in words is "five hundred thirty-one million, four hundred one thousand, seven hundred ninety-one".