1081678509 has 8 divisors (see below), whose sum is σ = 1602486720. Its totient is φ = 721118988.

The previous prime is 1081678487. The next prime is 1081678517. The reversal of 1081678509 is 9058761801.

1081678509 is a `hidden beast` number, since 1 + 0 + 81 + 67 + 8 + 509 = 666.

It is not a de Polignac number, because 1081678509 - 2⁸ = 1081678253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081676509) 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, 20031057 + ... + 20031110.

It is an arithmetic number, because the mean of its divisors is an integer number (200310840).

Almost surely, 2^1081678509 is an apocalyptic number.

It is an amenable number.

1081678509 is a deficient number, since it is larger than the sum of its proper divisors (520808211).

1081678509 is an equidigital number, since it uses as much as digits as its factorization.

1081678509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40062176 (or 40062170 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 1081678509 is about 32888.8812366733. The cubic root of 1081678509 is about 1026.5168132584.

The spelling of 1081678509 in words is "one billion, eighty-one million, six hundred seventy-eight thousand, five hundred nine".