1319681 has 4 divisors (see below), whose sum is σ = 1439664. Its totient is φ = 1199700.

The previous prime is 1319651. The next prime is 1319687. The reversal of 1319681 is 1869131.

It is a happy number.

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 1319681 - 2¹⁴ = 1303297 is a prime.

It is a super-2 number, since 2×1319681² = 3483115883522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1319687) 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, 59975 + ... + 59996.

It is an arithmetic number, because the mean of its divisors is an integer number (359916).

2^1319681 is an apocalyptic number.

1319681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1319681 is a deficient number, since it is larger than the sum of its proper divisors (119983).

1319681 is a wasteful number, since it uses less digits than its factorization.

1319681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119982.

The product of its digits is 1296, while the sum is 29.

The square root of 1319681 is about 1148.7736939885. The cubic root of 1319681 is about 109.6872937039.

The spelling of 1319681 in words is "one million, three hundred nineteen thousand, six hundred eighty-one".