531520387 has 2 divisors, whose sum is σ = 531520388. Its totient is φ = 531520386.

The previous prime is 531520357. The next prime is 531520397. The reversal of 531520387 is 783025135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531520387 - 2⁷ = 531520259 is a prime.

It is not a weakly prime, because it can be changed into another prime (531520337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265760193 + 265760194.

It is an arithmetic number, because the mean of its divisors is an integer number (265760194).

Almost surely, 2^531520387 is an apocalyptic number.

531520387 is a deficient number, since it is larger than the sum of its proper divisors (1).

531520387 is an equidigital number, since it uses as much as digits as its factorization.

531520387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 531520387 is about 23054.7259146579. The cubic root of 531520387 is about 810.0403307663.

The spelling of 531520387 in words is "five hundred thirty-one million, five hundred twenty thousand, three hundred eighty-seven".