1606551 has 16 divisors (see below), whose sum is σ = 2296800. Its totient is φ = 998784.

The previous prime is 1606547. The next prime is 1606559. The reversal of 1606551 is 1556061.

It is not a de Polignac number, because 1606551 - 2² = 1606547 is a prime.

It is a super-2 number, since 2×1606551² = 5162012231202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14685 + ... + 14793.

It is an arithmetic number, because the mean of its divisors is an integer number (143550).

2^1606551 is an apocalyptic number.

1606551 is a deficient number, since it is larger than the sum of its proper divisors (690249).

1606551 is an equidigital number, since it uses as much as digits as its factorization.

1606551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1606551 is about 1267.4979289924. The cubic root of 1606551 is about 117.1201191668.

The spelling of 1606551 in words is "one million, six hundred six thousand, five hundred fifty-one".