531400400387 has 2 divisors, whose sum is σ = 531400400388. Its totient is φ = 531400400386.

The previous prime is 531400400383. The next prime is 531400400417. The reversal of 531400400387 is 783004004135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531400400387 - 2² = 531400400383 is a prime.

It is not a weakly prime, because it can be changed into another prime (531400400381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265700200193 + 265700200194.

It is an arithmetic number, because the mean of its divisors is an integer number (265700200194).

Almost surely, 2^531400400387 is an apocalyptic number.

531400400387 is a deficient number, since it is larger than the sum of its proper divisors (1).

531400400387 is an equidigital number, since it uses as much as digits as its factorization.

531400400387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 531400400387 in words is "five hundred thirty-one billion, four hundred million, four hundred thousand, three hundred eighty-seven".