1608438631 has 2 divisors, whose sum is σ = 1608438632. Its totient is φ = 1608438630.

The previous prime is 1608438613. The next prime is 1608438677. The reversal of 1608438631 is 1368348061.

It is a happy number.

Together with previous prime (1608438613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1608438631 - 2¹⁵ = 1608405863 is a prime.

It is a super-2 number, since 2×1608438631² = 5174149659386308322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1608438431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804219315 + 804219316.

It is an arithmetic number, because the mean of its divisors is an integer number (804219316).

Almost surely, 2^1608438631 is an apocalyptic number.

1608438631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608438631 is an equidigital number, since it uses as much as digits as its factorization.

1608438631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 1608438631 is about 40105.3441700729. The cubic root of 1608438631 is about 1171.6597164575.

The spelling of 1608438631 in words is "one billion, six hundred eight million, four hundred thirty-eight thousand, six hundred thirty-one".