1061691609 has 16 divisors (see below), whose sum is σ = 1544840640. Its totient is φ = 643215360.

The previous prime is 1061691577. The next prime is 1061691611. The reversal of 1061691609 is 9061961601.

It is not a de Polignac number, because 1061691609 - 2⁵ = 1061691577 is a prime.

It is a super-2 number, since 2×1061691609² = 2254378145242017762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1061691809) 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, 141849 + ... + 149145.

It is an arithmetic number, because the mean of its divisors is an integer number (96552540).

Almost surely, 2^1061691609 is an apocalyptic number.

It is an amenable number.

1061691609 is a deficient number, since it is larger than the sum of its proper divisors (483149031).

1061691609 is a wasteful number, since it uses less digits than its factorization.

1061691609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11720.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1061691609 is about 32583.6095146010. The cubic root of 1061691609 is about 1020.1549197603.

The spelling of 1061691609 in words is "one billion, sixty-one million, six hundred ninety-one thousand, six hundred nine".