1609735421 has 16 divisors (see below), whose sum is σ = 1852671744. Its totient is φ = 1370079744.

The previous prime is 1609735411. The next prime is 1609735427. The reversal of 1609735421 is 1245379061.

It is a cyclic number.

It is not a de Polignac number, because 1609735421 - 2³⁰ = 535993597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609735427) 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, 648635 + ... + 651111.

It is an arithmetic number, because the mean of its divisors is an integer number (115791984).

Almost surely, 2^1609735421 is an apocalyptic number.

It is an amenable number.

1609735421 is a deficient number, since it is larger than the sum of its proper divisors (242936323).

1609735421 is a wasteful number, since it uses less digits than its factorization.

1609735421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1609735421 is about 40121.5082094380. The cubic root of 1609735421 is about 1171.9745121075.

The spelling of 1609735421 in words is "one billion, six hundred nine million, seven hundred thirty-five thousand, four hundred twenty-one".