1551611 has 4 divisors (see below), whose sum is σ = 1584672. Its totient is φ = 1518552.

The previous prime is 1551601. The next prime is 1551617. The reversal of 1551611 is 1161551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16460 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (396168).

2^1551611 is an apocalyptic number.

1551611 is a deficient number, since it is larger than the sum of its proper divisors (33061).

1551611 is an equidigital number, since it uses as much as digits as its factorization.

1551611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33060.

The product of its digits is 150, while the sum is 20.

The square root of 1551611 is about 1245.6367849417. The cubic root of 1551611 is about 115.7695334990.

The spelling of 1551611 in words is "one million, five hundred fifty-one thousand, six hundred eleven".