1381363621 has 4 divisors (see below), whose sum is σ = 1506942144. Its totient is φ = 1255785100.

The previous prime is 1381363619. The next prime is 1381363667. The reversal of 1381363621 is 1263631831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1381363621 - 2¹ = 1381363619 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 (1381363421) 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, 62789245 + ... + 62789266.

It is an arithmetic number, because the mean of its divisors is an integer number (376735536).

Almost surely, 2^1381363621 is an apocalyptic number.

1381363621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1381363621 is a deficient number, since it is larger than the sum of its proper divisors (125578523).

1381363621 is a wasteful number, since it uses less digits than its factorization.

1381363621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125578522.

The product of its digits is 15552, while the sum is 34.

The square root of 1381363621 is about 37166.7004319727. The cubic root of 1381363621 is about 1113.7028682258.

The spelling of 1381363621 in words is "one billion, three hundred eighty-one million, three hundred sixty-three thousand, six hundred twenty-one".