1381020871 has 4 divisors (see below), whose sum is σ = 1453706200. Its totient is φ = 1308335544.

The previous prime is 1381020863. The next prime is 1381020877. The reversal of 1381020871 is 1780201831.

It is a happy number.

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 1381020871 - 2³ = 1381020863 is a prime.

It is a super-2 number, since 2×1381020871² = 3814437292275197282, 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 (1381020877) 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, 36342636 + ... + 36342673.

It is an arithmetic number, because the mean of its divisors is an integer number (363426550).

Almost surely, 2^1381020871 is an apocalyptic number.

1381020871 is a deficient number, since it is larger than the sum of its proper divisors (72685329).

1381020871 is an equidigital number, since it uses as much as digits as its factorization.

1381020871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72685328.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1381020871 is about 37162.0891635548. The cubic root of 1381020871 is about 1113.6107483262.

The spelling of 1381020871 in words is "one billion, three hundred eighty-one million, twenty thousand, eight hundred seventy-one".