550138987 has 2 divisors, whose sum is σ = 550138988. Its totient is φ = 550138986.

The previous prime is 550138969. The next prime is 550138999. The reversal of 550138987 is 789831055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 550138987 - 2⁷ = 550138859 is a prime.

It is not a weakly prime, because it can be changed into another prime (550138937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275069493 + 275069494.

It is an arithmetic number, because the mean of its divisors is an integer number (275069494).

Almost surely, 2^550138987 is an apocalyptic number.

550138987 is a deficient number, since it is larger than the sum of its proper divisors (1).

550138987 is an equidigital number, since it uses as much as digits as its factorization.

550138987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 550138987 is about 23455.0418247335. The cubic root of 550138987 is about 819.3902799428.

It can be divided in two parts, 55013 and 8987, that added together give a cube (64000 = 40³).

The spelling of 550138987 in words is "five hundred fifty million, one hundred thirty-eight thousand, nine hundred eighty-seven".