1609009631 has 8 divisors (see below), whose sum is σ = 1615495104. Its totient is φ = 1602537760.

The previous prime is 1609009613. The next prime is 1609009657. The reversal of 1609009631 is 1369009061.

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 1609009631 - 2¹⁰ = 1609008607 is a prime.

It is a super-2 number, since 2×1609009631² = 5177823985301512322, 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 = 1609009591 and 1609009600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609009691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278585 + ... + 284301.

It is an arithmetic number, because the mean of its divisors is an integer number (201936888).

Almost surely, 2^1609009631 is an apocalyptic number.

1609009631 is a deficient number, since it is larger than the sum of its proper divisors (6485473).

1609009631 is an equidigital number, since it uses as much as digits as its factorization.

1609009631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1609009631 is about 40112.4622904154. The cubic root of 1609009631 is about 1171.7983474945.

The spelling of 1609009631 in words is "one billion, six hundred nine million, nine thousand, six hundred thirty-one".