1380121243 has 2 divisors, whose sum is σ = 1380121244. Its totient is φ = 1380121242.

The previous prime is 1380121189. The next prime is 1380121247. The reversal of 1380121243 is 3421210831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1380121243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1380121247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690060621 + 690060622.

It is an arithmetic number, because the mean of its divisors is an integer number (690060622).

Almost surely, 2^1380121243 is an apocalyptic number.

1380121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380121243 is an equidigital number, since it uses as much as digits as its factorization.

1380121243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1380121243 is about 37149.9830820957. The cubic root of 1380121243 is about 1113.3688854528.

The spelling of 1380121243 in words is "one billion, three hundred eighty million, one hundred twenty-one thousand, two hundred forty-three".