1601437509 has 12 divisors (see below), whose sum is σ = 2643642976. Its totient is φ = 915107112.

The previous prime is 1601437459. The next prime is 1601437543. The reversal of 1601437509 is 9057341061.

1601437509 is a `hidden beast` number, since 1 + 6 + 0 + 143 + 7 + 509 = 666.

It is not a de Polignac number, because 1601437509 - 2¹² = 1601433413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601437549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12709759 + ... + 12709884.

Almost surely, 2^1601437509 is an apocalyptic number.

It is an amenable number.

1601437509 is a deficient number, since it is larger than the sum of its proper divisors (1042205467).

1601437509 is a wasteful number, since it uses less digits than its factorization.

1601437509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25419656 (or 25419653 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1601437509 is about 40017.9648283118. The cubic root of 1601437509 is about 1169.9572655879.

The spelling of 1601437509 in words is "one billion, six hundred one million, four hundred thirty-seven thousand, five hundred nine".