1383521791 has 2 divisors, whose sum is σ = 1383521792. Its totient is φ = 1383521790.

The previous prime is 1383521759. The next prime is 1383521801. The reversal of 1383521791 is 1971253831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1383521791 - 2⁵ = 1383521759 is a prime.

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1383521291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691760895 + 691760896.

It is an arithmetic number, because the mean of its divisors is an integer number (691760896).

Almost surely, 2^1383521791 is an apocalyptic number.

1383521791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383521791 is an equidigital number, since it uses as much as digits as its factorization.

1383521791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 1383521791 is about 37195.7227514132. The cubic root of 1383521791 is about 1114.2825633994.

The spelling of 1383521791 in words is "one billion, three hundred eighty-three million, five hundred twenty-one thousand, seven hundred ninety-one".