1381685471 has 4 divisors (see below), whose sum is σ = 1383072312. Its totient is φ = 1380298632.

The previous prime is 1381685447. The next prime is 1381685497. The reversal of 1381685471 is 1745861831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381685471 is a prime.

It is a super-3 number, since 3×1381685471³ (a number of 28 digits) contains 333 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 (1381685411) 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, 691925 + ... + 693918.

It is an arithmetic number, because the mean of its divisors is an integer number (345768078).

Almost surely, 2^1381685471 is an apocalyptic number.

1381685471 is a deficient number, since it is larger than the sum of its proper divisors (1386841).

1381685471 is an equidigital number, since it uses as much as digits as its factorization.

1381685471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386840.

The product of its digits is 161280, while the sum is 44.

The square root of 1381685471 is about 37171.0299964905. The cubic root of 1381685471 is about 1113.7893570227.

The spelling of 1381685471 in words is "one billion, three hundred eighty-one million, six hundred eighty-five thousand, four hundred seventy-one".