1209130771 has 4 divisors (see below), whose sum is σ = 1222716600. Its totient is φ = 1195544944.

The previous prime is 1209130751. The next prime is 1209130777. The reversal of 1209130771 is 1770319021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1770319021 = 17 ⋅104136413.

It is a cyclic number.

It is not a de Polignac number, because 1209130771 - 2⁵ = 1209130739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209130777) 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, 6792781 + ... + 6792958.

It is an arithmetic number, because the mean of its divisors is an integer number (305679150).

Almost surely, 2^1209130771 is an apocalyptic number.

1209130771 is a deficient number, since it is larger than the sum of its proper divisors (13585829).

1209130771 is an equidigital number, since it uses as much as digits as its factorization.

1209130771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13585828.

The product of its (nonzero) digits is 2646, while the sum is 31.

The square root of 1209130771 is about 34772.5577287608. The cubic root of 1209130771 is about 1065.3470096997.

Adding to 1209130771 its reverse (1770319021), we get a palindrome (2979449792).

The spelling of 1209130771 in words is "one billion, two hundred nine million, one hundred thirty thousand, seven hundred seventy-one".