1551601 has 2 divisors, whose sum is σ = 1551602. Its totient is φ = 1551600.

The previous prime is 1551593. The next prime is 1551617. The reversal of 1551601 is 1061551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 159201 = 1180^2 + 399^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551601 - 2³ = 1551593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775800 + 775801.

It is an arithmetic number, because the mean of its divisors is an integer number (775801).

2^1551601 is an apocalyptic number.

It is an amenable number.

1551601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551601 is an equidigital number, since it uses as much as digits as its factorization.

1551601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1551601 is about 1245.6327709241. The cubic root of 1551601 is about 115.7692847902.

The spelling of 1551601 in words is "one million, five hundred fifty-one thousand, six hundred one".