1553990171 has 2 divisors, whose sum is σ = 1553990172. Its totient is φ = 1553990170.

The previous prime is 1553990167. The next prime is 1553990197. The reversal of 1553990171 is 1710993551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1553990171 - 2² = 1553990167 is a prime.

It is not a weakly prime, because it can be changed into another prime (1553990131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776995085 + 776995086.

It is an arithmetic number, because the mean of its divisors is an integer number (776995086).

Almost surely, 2^1553990171 is an apocalyptic number.

1553990171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553990171 is an equidigital number, since it uses as much as digits as its factorization.

1553990171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42525, while the sum is 41.

The square root of 1553990171 is about 39420.6820209899. The cubic root of 1553990171 is about 1158.2867522470.

The spelling of 1553990171 in words is "one billion, five hundred fifty-three million, nine hundred ninety thousand, one hundred seventy-one".