1606631 has 8 divisors (see below), whose sum is σ = 1752240. Its totient is φ = 1464192.

The previous prime is 1606603. The next prime is 1606639. The reversal of 1606631 is 1366061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1606631 - 2¹⁴ = 1590247 is a prime.

It is a super-2 number, since 2×1606631² = 5162526340322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1606597 and 1606606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606639) 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 in 7 ways as a sum of consecutive naturals, for example, 335 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (219030).

2^1606631 is an apocalyptic number.

1606631 is a deficient number, since it is larger than the sum of its proper divisors (145609).

1606631 is a wasteful number, since it uses less digits than its factorization.

1606631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1606631 is about 1267.5294868365. The cubic root of 1606631 is about 117.1220631769.

The spelling of 1606631 in words is "one million, six hundred six thousand, six hundred thirty-one".