1551604 has 12 divisors (see below), whose sum is σ = 2781828. Its totient is φ = 756800.

The previous prime is 1551601. The next prime is 1551617. The reversal of 1551604 is 4061551.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 1004004 = 740^2 + 1002^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551601) 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 in 3 ways as a sum of consecutive naturals, for example, 4567 + ... + 4894.

It is an arithmetic number, because the mean of its divisors is an integer number (231819).

2^1551604 is an apocalyptic number.

It is an amenable number.

1551604 is a deficient number, since it is larger than the sum of its proper divisors (1230224).

1551604 is a wasteful number, since it uses less digits than its factorization.

1551604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506 (or 9504 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1551604 is about 1245.6339751307. The cubic root of 1551604 is about 115.7693594030.

The spelling of 1551604 in words is "one million, five hundred fifty-one thousand, six hundred four".