1351643 has 4 divisors (see below), whose sum is σ = 1366920. Its totient is φ = 1336368.

The previous prime is 1351639. The next prime is 1351663. The reversal of 1351643 is 3461531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3461531 = 1093 ⋅3167.

It is a cyclic number.

It is not a de Polignac number, because 1351643 - 2² = 1351639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351663) 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, 7505 + ... + 7682.

It is an arithmetic number, because the mean of its divisors is an integer number (341730).

2^1351643 is an apocalyptic number.

1351643 is a deficient number, since it is larger than the sum of its proper divisors (15277).

1351643 is an equidigital number, since it uses as much as digits as its factorization.

1351643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15276.

The product of its digits is 1080, while the sum is 23.

The square root of 1351643 is about 1162.6018234976. The cubic root of 1351643 is about 110.5657628103.

The spelling of 1351643 in words is "one million, three hundred fifty-one thousand, six hundred forty-three".