1554223889 has 2 divisors, whose sum is σ = 1554223890. Its totient is φ = 1554223888.

The previous prime is 1554223829. The next prime is 1554223897. The reversal of 1554223889 is 9883224551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1292043025 + 262180864 = 35945^2 + 16192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554223889 - 2⁸ = 1554223633 is a prime.

It is a super-2 number, since 2×1554223889² = 4831223794276568642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1554223829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777111944 + 777111945.

It is an arithmetic number, because the mean of its divisors is an integer number (777111945).

Almost surely, 2^1554223889 is an apocalyptic number.

It is an amenable number.

1554223889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554223889 is an equidigital number, since it uses as much as digits as its factorization.

1554223889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 47.

The square root of 1554223889 is about 39423.6463179143. The cubic root of 1554223889 is about 1158.3448175848.

The spelling of 1554223889 in words is "one billion, five hundred fifty-four million, two hundred twenty-three thousand, eight hundred eighty-nine".