1551664 has 10 divisors (see below), whose sum is σ = 3006380. Its totient is φ = 775824.

The previous prime is 1551661. The next prime is 1551677. The reversal of 1551664 is 4661551.

It is a super-2 number, since 2×1551664² = 4815322337792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1551661) 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, 48474 + ... + 48505.

It is an arithmetic number, because the mean of its divisors is an integer number (300638).

2^1551664 is an apocalyptic number.

It is an amenable number.

1551664 is a deficient number, since it is larger than the sum of its proper divisors (1454716).

1551664 is an equidigital number, since it uses as much as digits as its factorization.

1551664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96987 (or 96981 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 1551664 is about 1245.6580590194. The cubic root of 1551664 is about 115.7708516377.

The spelling of 1551664 in words is "one million, five hundred fifty-one thousand, six hundred sixty-four".