531878387 has 2 divisors, whose sum is σ = 531878388. Its totient is φ = 531878386.

The previous prime is 531878353. The next prime is 531878401. The reversal of 531878387 is 783878135.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531878387 is a prime.

It is not a weakly prime, because it can be changed into another prime (531878317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265939193 + 265939194.

It is an arithmetic number, because the mean of its divisors is an integer number (265939194).

Almost surely, 2^531878387 is an apocalyptic number.

531878387 is a deficient number, since it is larger than the sum of its proper divisors (1).

531878387 is an equidigital number, since it uses as much as digits as its factorization.

531878387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The square root of 531878387 is about 23062.4887425447. The cubic root of 531878387 is about 810.2221546827. Note that the first 3 decimals are identical.

The spelling of 531878387 in words is "five hundred thirty-one million, eight hundred seventy-eight thousand, three hundred eighty-seven".