1552721641 has 2 divisors, whose sum is σ = 1552721642. Its totient is φ = 1552721640.

The previous prime is 1552721627. The next prime is 1552721663. The reversal of 1552721641 is 1461272551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1283072400 + 269649241 = 35820^2 + 16421^2 .

It is a cyclic number.

It is not a de Polignac number, because 1552721641 - 2¹¹ = 1552719593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1552721597 and 1552721606.

It is not a weakly prime, because it can be changed into another prime (1552721671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776360820 + 776360821.

It is an arithmetic number, because the mean of its divisors is an integer number (776360821).

Almost surely, 2^1552721641 is an apocalyptic number.

It is an amenable number.

1552721641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552721641 is an equidigital number, since it uses as much as digits as its factorization.

1552721641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 1552721641 is about 39404.5890855367. The cubic root of 1552721641 is about 1157.9714946802.

The spelling of 1552721641 in words is "one billion, five hundred fifty-two million, seven hundred twenty-one thousand, six hundred forty-one".