1361645 has 4 divisors (see below), whose sum is σ = 1633980. Its totient is φ = 1089312.

The previous prime is 1361629. The next prime is 1361677. The reversal of 1361645 is 5461631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461631 = 7 ⋅780233.

It can be written as a sum of positive squares in 2 ways, for example, as 306916 + 1054729 = 554^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361645 - 2⁴ = 1361629 is a prime.

It is a super-3 number, since 3×1361645³ = 7573784463100233375, which contains 333 as substring.

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, 136160 + ... + 136169.

It is an arithmetic number, because the mean of its divisors is an integer number (408495).

2^1361645 is an apocalyptic number.

It is an amenable number.

1361645 is a deficient number, since it is larger than the sum of its proper divisors (272335).

1361645 is an equidigital number, since it uses as much as digits as its factorization.

1361645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272334.

The product of its digits is 2160, while the sum is 26.

The square root of 1361645 is about 1166.8954537575. The cubic root of 1361645 is about 110.8378174202.

The spelling of 1361645 in words is "one million, three hundred sixty-one thousand, six hundred forty-five".