1551656 has 8 divisors (see below), whose sum is σ = 2909370. Its totient is φ = 775824.

The previous prime is 1551647. The next prime is 1551659. The reversal of 1551656 is 6561551.

It can be written as a sum of positive squares in only one way, i.e., 1522756 + 28900 = 1234^2 + 170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1551659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96971 + ... + 96986.

2^1551656 is an apocalyptic number.

It is an amenable number.

1551656 is a deficient number, since it is larger than the sum of its proper divisors (1357714).

1551656 is a wasteful number, since it uses less digits than its factorization.

1551656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193963 (or 193959 counting only the distinct ones).

The product of its digits is 4500, while the sum is 29.

The square root of 1551656 is about 1245.6548478612. The cubic root of 1551656 is about 115.7706526753.

The spelling of 1551656 in words is "one million, five hundred fifty-one thousand, six hundred fifty-six".