1955554019 has 2 divisors, whose sum is σ = 1955554020. Its totient is φ = 1955554018.

The previous prime is 1955554009. The next prime is 1955554037. The reversal of 1955554019 is 9104555591.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955554019 is a prime.

It is a super-2 number, since 2×1955554019² = 7648383042454104722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1955554009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977777009 + 977777010.

It is an arithmetic number, because the mean of its divisors is an integer number (977777010).

Almost surely, 2^1955554019 is an apocalyptic number.

1955554019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955554019 is an equidigital number, since it uses as much as digits as its factorization.

1955554019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 44.

The square root of 1955554019 is about 44221.6464980670. The cubic root of 1955554019 is about 1250.5179760510.

The spelling of 1955554019 in words is "one billion, nine hundred fifty-five million, five hundred fifty-four thousand, nineteen".