1381319643 has 16 divisors (see below), whose sum is σ = 2058198912. Its totient is φ = 816744000.

The previous prime is 1381319593. The next prime is 1381319647. The reversal of 1381319643 is 3469131831.

It is not a de Polignac number, because 1381319643 - 2⁹ = 1381319131 is a prime.

It is a super-2 number, since 2×1381319643² = 3816087912275294898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1381319647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509113 + ... + 511818.

It is an arithmetic number, because the mean of its divisors is an integer number (128637432).

Almost surely, 2^1381319643 is an apocalyptic number.

1381319643 is a deficient number, since it is larger than the sum of its proper divisors (676879269).

1381319643 is a wasteful number, since it uses less digits than its factorization.

1381319643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020986.

The product of its digits is 46656, while the sum is 39.

The square root of 1381319643 is about 37166.1087955142. The cubic root of 1381319643 is about 1113.6910492415.

The spelling of 1381319643 in words is "one billion, three hundred eighty-one million, three hundred nineteen thousand, six hundred forty-three".