556516381 has 2 divisors, whose sum is σ = 556516382. Its totient is φ = 556516380.

The previous prime is 556516361. The next prime is 556516423. The reversal of 556516381 is 183615655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410710756 + 145805625 = 20266^2 + 12075^2 .

It is a cyclic number.

It is not a de Polignac number, because 556516381 - 2⁷ = 556516253 is a prime.

It is a super-2 number, since 2×556516381² = 619420964642674322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556516361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278258190 + 278258191.

It is an arithmetic number, because the mean of its divisors is an integer number (278258191).

Almost surely, 2^556516381 is an apocalyptic number.

It is an amenable number.

556516381 is a deficient number, since it is larger than the sum of its proper divisors (1).

556516381 is an equidigital number, since it uses as much as digits as its factorization.

556516381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 40.

The square root of 556516381 is about 23590.5994201080. The cubic root of 556516381 is about 822.5443383556.

The spelling of 556516381 in words is "five hundred fifty-six million, five hundred sixteen thousand, three hundred eighty-one".