1383481921 has 2 divisors, whose sum is σ = 1383481922. Its totient is φ = 1383481920.

The previous prime is 1383481849. The next prime is 1383481933. The reversal of 1383481921 is 1291843831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1227731521 + 155750400 = 35039^2 + 12480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383481921 - 2⁷ = 1383481793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1383481621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691740960 + 691740961.

It is an arithmetic number, because the mean of its divisors is an integer number (691740961).

Almost surely, 2^1383481921 is an apocalyptic number.

It is an amenable number.

1383481921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383481921 is an equidigital number, since it uses as much as digits as its factorization.

1383481921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 1383481921 is about 37195.1867988319. The cubic root of 1383481921 is about 1114.2718595871.

The spelling of 1383481921 in words is "one billion, three hundred eighty-three million, four hundred eighty-one thousand, nine hundred twenty-one".