1608631 has 4 divisors (see below), whose sum is σ = 1635064. Its totient is φ = 1582200.

The previous prime is 1608617. The next prime is 1608637. The reversal of 1608631 is 1368061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1368061 = 31 ⋅44131.

It is a cyclic number.

It is not a de Polignac number, because 1608631 - 2⁵ = 1608599 is a prime.

It is a super-2 number, since 2×1608631² = 5175387388322, 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 = 1608596 and 1608605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608637) 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, 13125 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (408766).

2^1608631 is an apocalyptic number.

1608631 is a deficient number, since it is larger than the sum of its proper divisors (26433).

1608631 is an equidigital number, since it uses as much as digits as its factorization.

1608631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26432.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1608631 is about 1268.3181777456. The cubic root of 1608631 is about 117.1706424700.

The spelling of 1608631 in words is "one million, six hundred eight thousand, six hundred thirty-one".