1381624291 has 2 divisors, whose sum is σ = 1381624292. Its totient is φ = 1381624290.

The previous prime is 1381624261. The next prime is 1381624301. The reversal of 1381624291 is 1924261831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381624291 - 2⁵ = 1381624259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381624291.

It is not a weakly prime, because it can be changed into another prime (1381624261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690812145 + 690812146.

It is an arithmetic number, because the mean of its divisors is an integer number (690812146).

Almost surely, 2^1381624291 is an apocalyptic number.

1381624291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381624291 is an equidigital number, since it uses as much as digits as its factorization.

1381624291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 1381624291 is about 37170.2070346669. The cubic root of 1381624291 is about 1113.7729175266.

The spelling of 1381624291 in words is "one billion, three hundred eighty-one million, six hundred twenty-four thousand, two hundred ninety-one".