1061993809 has 4 divisors (see below), whose sum is σ = 1117888240. Its totient is φ = 1006099380.

The previous prime is 1061993773. The next prime is 1061993819. The reversal of 1061993809 is 9083991601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9083991601 = 199 ⋅45648199.

It is a cyclic number.

It is not a de Polignac number, because 1061993809 - 2²⁷ = 927776081 is a prime.

It is a super-2 number, since 2×1061993809² = 2255661700708656962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061993819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27947187 + ... + 27947224.

It is an arithmetic number, because the mean of its divisors is an integer number (279472060).

Almost surely, 2^1061993809 is an apocalyptic number.

1061993809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1061993809 is a deficient number, since it is larger than the sum of its proper divisors (55894431).

1061993809 is an equidigital number, since it uses as much as digits as its factorization.

1061993809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55894430.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 1061993809 is about 32588.2464855046. The cubic root of 1061993809 is about 1020.2517029091.

The spelling of 1061993809 in words is "one billion, sixty-one million, nine hundred ninety-three thousand, eight hundred nine".