1381109623 has 4 divisors (see below), whose sum is σ = 1381621408. Its totient is φ = 1380597840.

The previous prime is 1381109603. The next prime is 1381109627. The reversal of 1381109623 is 3269011831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1381109623 - 2⁵ = 1381109591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381109627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251823 + ... + 257248.

It is an arithmetic number, because the mean of its divisors is an integer number (345405352).

Almost surely, 2^1381109623 is an apocalyptic number.

1381109623 is a deficient number, since it is larger than the sum of its proper divisors (511785).

1381109623 is an equidigital number, since it uses as much as digits as its factorization.

1381109623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511784.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1381109623 is about 37163.2832645341. The cubic root of 1381109623 is about 1113.6346033999.

The spelling of 1381109623 in words is "one billion, three hundred eighty-one million, one hundred nine thousand, six hundred twenty-three".