1311689785 has 8 divisors (see below), whose sum is σ = 1798888896. Its totient is φ = 899444400.

The previous prime is 1311689783. The next prime is 1311689789. The reversal of 1311689785 is 5879861131.

It is a happy number.

1311689785 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311689785 - 2¹ = 1311689783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311689783) 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, 18738391 + ... + 18738460.

It is an arithmetic number, because the mean of its divisors is an integer number (224861112).

Almost surely, 2^1311689785 is an apocalyptic number.

It is an amenable number.

1311689785 is a deficient number, since it is larger than the sum of its proper divisors (487199111).

1311689785 is an equidigital number, since it uses as much as digits as its factorization.

1311689785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37476863.

The product of its digits is 362880, while the sum is 49.

The square root of 1311689785 is about 36217.2581099122. The cubic root of 1311689785 is about 1094.6544464011.

The spelling of 1311689785 in words is "one billion, three hundred eleven million, six hundred eighty-nine thousand, seven hundred eighty-five".