1381612663 has 4 divisors (see below), whose sum is σ = 1382690808. Its totient is φ = 1380534520.

The previous prime is 1381612571. The next prime is 1381612667. The reversal of 1381612663 is 3662161831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3662161831 = 4273 ⋅857047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381612663 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 (1381612667) 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, 537148 + ... + 539713.

It is an arithmetic number, because the mean of its divisors is an integer number (345672702).

Almost surely, 2^1381612663 is an apocalyptic number.

1381612663 is a deficient number, since it is larger than the sum of its proper divisors (1078145).

1381612663 is a wasteful number, since it uses less digits than its factorization.

1381612663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078144.

The product of its digits is 31104, while the sum is 37.

The square root of 1381612663 is about 37170.0506187441. The cubic root of 1381612663 is about 1113.7697929464.

The spelling of 1381612663 in words is "one billion, three hundred eighty-one million, six hundred twelve thousand, six hundred sixty-three".