1306772381 has 2 divisors, whose sum is σ = 1306772382. Its totient is φ = 1306772380.

The previous prime is 1306772353. The next prime is 1306772429. The reversal of 1306772381 is 1832776031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1298449156 + 8323225 = 36034^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306772381 - 2¹⁰ = 1306771357 is a prime.

It is a super-2 number, since 2×1306772381² = 3415308111488818322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306772351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653386190 + 653386191.

It is an arithmetic number, because the mean of its divisors is an integer number (653386191).

Almost surely, 2^1306772381 is an apocalyptic number.

It is an amenable number.

1306772381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306772381 is an equidigital number, since it uses as much as digits as its factorization.

1306772381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 1306772381 is about 36149.3067845014. The cubic root of 1306772381 is about 1093.2848139182.

The spelling of 1306772381 in words is "one billion, three hundred six million, seven hundred seventy-two thousand, three hundred eighty-one".