1555651061 has 2 divisors, whose sum is σ = 1555651062. Its totient is φ = 1555651060.

The previous prime is 1555651037. The next prime is 1555651081. The reversal of 1555651061 is 1601565551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1506216100 + 49434961 = 38810^2 + 7031^2 .

It is an emirp because it is prime and its reverse (1601565551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1555651061 - 2⁶ = 1555650997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555651081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777825530 + 777825531.

It is an arithmetic number, because the mean of its divisors is an integer number (777825531).

Almost surely, 2^1555651061 is an apocalyptic number.

It is an amenable number.

1555651061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555651061 is an equidigital number, since it uses as much as digits as its factorization.

1555651061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1555651061 is about 39441.7426212382. The cubic root of 1555651061 is about 1158.6992606295.

The spelling of 1555651061 in words is "one billion, five hundred fifty-five million, six hundred fifty-one thousand, sixty-one".