1383561917 has 2 divisors, whose sum is σ = 1383561918. Its totient is φ = 1383561916.

The previous prime is 1383561887. The next prime is 1383561953. The reversal of 1383561917 is 7191653831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192597156 + 190964761 = 34534^2 + 13819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383561917 - 2⁶ = 1383561853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1383567917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691780958 + 691780959.

It is an arithmetic number, because the mean of its divisors is an integer number (691780959).

Almost surely, 2^1383561917 is an apocalyptic number.

It is an amenable number.

1383561917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383561917 is an equidigital number, since it uses as much as digits as its factorization.

1383561917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 1383561917 is about 37196.2621374783. The cubic root of 1383561917 is about 1114.2933357318.

The spelling of 1383561917 in words is "one billion, three hundred eighty-three million, five hundred sixty-one thousand, nine hundred seventeen".