1555000919 has 2 divisors, whose sum is σ = 1555000920. Its totient is φ = 1555000918.

The previous prime is 1555000901. The next prime is 1555000921. The reversal of 1555000919 is 9190005551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1555000919 - 2⁸ = 1555000663 is a prime.

It is a super-2 number, since 2×1555000919² = 4836055716181689122, which contains 22 as substring.

Together with 1555000921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555000939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777500459 + 777500460.

It is an arithmetic number, because the mean of its divisors is an integer number (777500460).

Almost surely, 2^1555000919 is an apocalyptic number.

1555000919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555000919 is an equidigital number, since it uses as much as digits as its factorization.

1555000919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10125, while the sum is 35.

The square root of 1555000919 is about 39433.4999587914. The cubic root of 1555000919 is about 1158.5378225364.

The spelling of 1555000919 in words is "one billion, five hundred fifty-five million, nine hundred nineteen", and thus it is an aban number.