1381550647 has 2 divisors, whose sum is σ = 1381550648. Its totient is φ = 1381550646.

The previous prime is 1381550627. The next prime is 1381550689. The reversal of 1381550647 is 7460551831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381550647 is a prime.

It is a super-2 number, since 2×1381550647² = 3817364380452237218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381550627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690775323 + 690775324.

It is an arithmetic number, because the mean of its divisors is an integer number (690775324).

Almost surely, 2^1381550647 is an apocalyptic number.

1381550647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381550647 is an equidigital number, since it uses as much as digits as its factorization.

1381550647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 1381550647 is about 37169.2163893725. The cubic root of 1381550647 is about 1113.7531282224.

The spelling of 1381550647 in words is "one billion, three hundred eighty-one million, five hundred fifty thousand, six hundred forty-seven".