1063966381 has 4 divisors (see below), whose sum is σ = 1064707200. Its totient is φ = 1063225564.

The previous prime is 1063966373. The next prime is 1063966399. The reversal of 1063966381 is 1836693601.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1836693601 = 30697 ⋅59833.

It is a cyclic number.

It is not a de Polignac number, because 1063966381 - 2³ = 1063966373 is a prime.

It is a super-2 number, since 2×1063966381² = 2264048919796474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1063964381) 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, 368251 + ... + 371128.

It is an arithmetic number, because the mean of its divisors is an integer number (266176800).

Almost surely, 2^1063966381 is an apocalyptic number.

It is an amenable number.

1063966381 is a deficient number, since it is larger than the sum of its proper divisors (740819).

1063966381 is an equidigital number, since it uses as much as digits as its factorization.

1063966381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740818.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 1063966381 is about 32618.4975282431. The cubic root of 1063966381 is about 1020.8829919604.

The spelling of 1063966381 in words is "one billion, sixty-three million, nine hundred sixty-six thousand, three hundred eighty-one".