1381978033 has 2 divisors, whose sum is σ = 1381978034. Its totient is φ = 1381978032.

The previous prime is 1381978001. The next prime is 1381978057. The reversal of 1381978033 is 3308791831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1310946849 + 71031184 = 36207^2 + 8428^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381978033 - 2⁵ = 1381978001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381978133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690989016 + 690989017.

It is an arithmetic number, because the mean of its divisors is an integer number (690989017).

Almost surely, 2^1381978033 is an apocalyptic number.

It is an amenable number.

1381978033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381978033 is an equidigital number, since it uses as much as digits as its factorization.

1381978033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1381978033 is about 37174.9651378451. The cubic root of 1381978033 is about 1113.8679637805.

The spelling of 1381978033 in words is "one billion, three hundred eighty-one million, nine hundred seventy-eight thousand, thirty-three".