1337681 has 4 divisors (see below), whose sum is σ = 1380864. Its totient is φ = 1294500.

The previous prime is 1337671. The next prime is 1337689. The reversal of 1337681 is 1867331.

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: 1867331 = 17 ⋅109843.

It is a cyclic number.

It is not a de Polignac number, because 1337681 - 2⁶ = 1337617 is a prime.

It is a super-2 number, since 2×1337681² = 3578780915522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1337689) 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, 21545 + ... + 21606.

It is an arithmetic number, because the mean of its divisors is an integer number (345216).

2^1337681 is an apocalyptic number.

It is an amenable number.

1337681 is a deficient number, since it is larger than the sum of its proper divisors (43183).

1337681 is an equidigital number, since it uses as much as digits as its factorization.

1337681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43182.

The product of its digits is 3024, while the sum is 29.

The square root of 1337681 is about 1156.5816010987. The cubic root of 1337681 is about 110.1837424949.

The spelling of 1337681 in words is "one million, three hundred thirty-seven thousand, six hundred eighty-one".