1306021131 has 16 divisors (see below), whose sum is σ = 1943531520. Its totient is φ = 866772360.

The previous prime is 1306021111. The next prime is 1306021133. The reversal of 1306021131 is 1311206031.

1306021131 is a `hidden beast` number, since 1 + 30 + 602 + 1 + 1 + 31 = 666.

It is not a de Polignac number, because 1306021131 - 2⁵ = 1306021099 is a prime.

It is a super-2 number, since 2×1306021131² = 3411382389237038322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1306021133) 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, 102435 + ... + 114476.

It is an arithmetic number, because the mean of its divisors is an integer number (121470720).

Almost surely, 2^1306021131 is an apocalyptic number.

1306021131 is a deficient number, since it is larger than the sum of its proper divisors (637510389).

1306021131 is a wasteful number, since it uses less digits than its factorization.

1306021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217143 (or 217137 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1306021131 is about 36138.9143583478. The cubic root of 1306021131 is about 1093.0752676932.

Adding to 1306021131 its reverse (1311206031), we get a palindrome (2617227162).

It can be divided in two parts, 13060 and 21131, that added together give a triangular number (34191 = T₂₆₁).

The spelling of 1306021131 in words is "one billion, three hundred six million, twenty-one thousand, one hundred thirty-one".