1552873981 has 2 divisors, whose sum is σ = 1552873982. Its totient is φ = 1552873980.

The previous prime is 1552873967. The next prime is 1552874021. The reversal of 1552873981 is 1893782551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1551572100 + 1301881 = 39390^2 + 1141^2 .

It is an emirp because it is prime and its reverse (1893782551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1552873981 is a prime.

It is a super-2 number, since 2×1552873981² = 4822835201733576722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1552873901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776436990 + 776436991.

It is an arithmetic number, because the mean of its divisors is an integer number (776436991).

Almost surely, 2^1552873981 is an apocalyptic number.

It is an amenable number.

1552873981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552873981 is an equidigital number, since it uses as much as digits as its factorization.

1552873981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 49.

The square root of 1552873981 is about 39406.5220617095. The cubic root of 1552873981 is about 1158.0093635860.

The spelling of 1552873981 in words is "one billion, five hundred fifty-two million, eight hundred seventy-three thousand, nine hundred eighty-one".