1311072730 has 32 divisors (see below), whose sum is σ = 2579117760. Its totient is φ = 475893120.

The previous prime is 1311072649. The next prime is 1311072757. The reversal of 1311072730 is 372701131.

It is a junction number, because it is equal to n+sod(n) for n = 1311072695 and 1311072704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52117 + ... + 73063.

It is an arithmetic number, because the mean of its divisors is an integer number (80597430).

Almost surely, 2^1311072730 is an apocalyptic number.

1311072730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311072730 is a deficient number, since it is larger than the sum of its proper divisors (1268045030).

1311072730 is a wasteful number, since it uses less digits than its factorization.

1311072730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21534.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 1311072730 is about 36208.7383099715. The cubic root of 1311072730 is about 1094.4827676110.

Adding to 1311072730 its reverse (372701131), we get a palindrome (1683773861).

The spelling of 1311072730 in words is "one billion, three hundred eleven million, seventy-two thousand, seven hundred thirty".