1608303421 has 2 divisors, whose sum is σ = 1608303422. Its totient is φ = 1608303420.

The previous prime is 1608303419. The next prime is 1608303449. The reversal of 1608303421 is 1243038061.

1608303421 = T₃₂₇₄₃ + T₃₂₇₄₄ + T₃₂₇₄₅.

It is an a-pointer prime, because the next prime (1608303449) can be obtained adding 1608303421 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1522092196 + 86211225 = 39014^2 + 9285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608303421 - 2¹ = 1608303419 is a prime.

Together with 1608303419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1608303421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1608303821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804151710 + 804151711.

It is an arithmetic number, because the mean of its divisors is an integer number (804151711).

Almost surely, 2^1608303421 is an apocalyptic number.

1608303421 is the 32745-th centered triangular number.

It is an amenable number.

1608303421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608303421 is an equidigital number, since it uses as much as digits as its factorization.

1608303421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1608303421 is about 40103.6584490742. The cubic root of 1608303421 is about 1171.6268845035.

The spelling of 1608303421 in words is "one billion, six hundred eight million, three hundred three thousand, four hundred twenty-one".