1351645 has 4 divisors (see below), whose sum is σ = 1621980. Its totient is φ = 1081312.

The previous prime is 1351639. The next prime is 1351663. The reversal of 1351645 is 5461531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461531 = 19 ⋅287449.

It can be written as a sum of positive squares in 2 ways, for example, as 363609 + 988036 = 603^2 + 994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1351645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135160 + ... + 135169.

It is an arithmetic number, because the mean of its divisors is an integer number (405495).

2^1351645 is an apocalyptic number.

It is an amenable number.

1351645 is a deficient number, since it is larger than the sum of its proper divisors (270335).

1351645 is an equidigital number, since it uses as much as digits as its factorization.

1351645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270334.

The product of its digits is 1800, while the sum is 25.

The square root of 1351645 is about 1162.6026836370. The cubic root of 1351645 is about 110.5658173442.

The spelling of 1351645 in words is "one million, three hundred fifty-one thousand, six hundred forty-five".