1381044491 has 2 divisors, whose sum is σ = 1381044492. Its totient is φ = 1381044490.

The previous prime is 1381044481. The next prime is 1381044517. The reversal of 1381044491 is 1944401831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381044491 is a prime.

It is a super-2 number, since 2×1381044491² = 3814567772242898162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1381044421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690522245 + 690522246.

It is an arithmetic number, because the mean of its divisors is an integer number (690522246).

Almost surely, 2^1381044491 is an apocalyptic number.

1381044491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381044491 is an equidigital number, since it uses as much as digits as its factorization.

1381044491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1381044491 is about 37162.4069591839. The cubic root of 1381044491 is about 1113.6170970924.

The spelling of 1381044491 in words is "one billion, three hundred eighty-one million, forty-four thousand, four hundred ninety-one".