1552981361 has 2 divisors, whose sum is σ = 1552981362. Its totient is φ = 1552981360.

The previous prime is 1552981351. The next prime is 1552981393. The reversal of 1552981361 is 1631892551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1470262336 + 82719025 = 38344^2 + 9095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1552981361 is a prime.

It is a super-2 number, since 2×1552981361² = 4823502215226824642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1552981351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776490680 + 776490681.

It is an arithmetic number, because the mean of its divisors is an integer number (776490681).

Almost surely, 2^1552981361 is an apocalyptic number.

It is an amenable number.

1552981361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552981361 is an equidigital number, since it uses as much as digits as its factorization.

1552981361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 1552981361 is about 39407.8845029773. The cubic root of 1552981361 is about 1158.0360547795.

The spelling of 1552981361 in words is "one billion, five hundred fifty-two million, nine hundred eighty-one thousand, three hundred sixty-one".