1361155 has 4 divisors (see below), whose sum is σ = 1633392. Its totient is φ = 1088920.

The previous prime is 1361153. The next prime is 1361183. The reversal of 1361155 is 5511631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1361155 - 2¹ = 1361153 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361153) 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, 136111 + ... + 136120.

It is an arithmetic number, because the mean of its divisors is an integer number (408348).

2^1361155 is an apocalyptic number.

1361155 is a deficient number, since it is larger than the sum of its proper divisors (272237).

1361155 is an equidigital number, since it uses as much as digits as its factorization.

1361155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272236.

The product of its digits is 450, while the sum is 22.

The square root of 1361155 is about 1166.6854760389. The cubic root of 1361155 is about 110.8245205020.

Adding to 1361155 its reverse (5511631), we get a palindrome (6872786).

It can be divided in two parts, 136 and 1155, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 1361155 in words is "one million, three hundred sixty-one thousand, one hundred fifty-five".