1331147785 has 16 divisors (see below), whose sum is σ = 1758588480. Its totient is φ = 959221440.

The previous prime is 1331147777. The next prime is 1331147789. The reversal of 1331147785 is 5877411331.

It is not a de Polignac number, because 1331147785 - 2³ = 1331147777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331147789) 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, 105027 + ... + 117016.

It is an arithmetic number, because the mean of its divisors is an integer number (109911780).

Almost surely, 2^1331147785 is an apocalyptic number.

It is an amenable number.

1331147785 is a deficient number, since it is larger than the sum of its proper divisors (427440695).

1331147785 is a wasteful number, since it uses less digits than its factorization.

1331147785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222168.

The product of its digits is 70560, while the sum is 40.

The square root of 1331147785 is about 36484.8980401481. The cubic root of 1331147785 is about 1100.0407106145.

The spelling of 1331147785 in words is "one billion, three hundred thirty-one million, one hundred forty-seven thousand, seven hundred eighty-five".