1225155 has 8 divisors (see below), whose sum is σ = 1960272. Its totient is φ = 653408.

The previous prime is 1225153. The next prime is 1225157. The reversal of 1225155 is 5515221.

It is an interprime number because it is at equal distance from previous prime (1225153) and next prime (1225157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225155 - 2¹ = 1225153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40824 + ... + 40853.

It is an arithmetic number, because the mean of its divisors is an integer number (245034).

2^1225155 is an apocalyptic number.

1225155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1225155 is a deficient number, since it is larger than the sum of its proper divisors (735117).

1225155 is an equidigital number, since it uses as much as digits as its factorization.

1225155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81685.

The product of its digits is 500, while the sum is 21.

The square root of 1225155 is about 1106.8672007066. The cubic root of 1225155 is about 107.0032607385.

The spelling of 1225155 in words is "one million, two hundred twenty-five thousand, one hundred fifty-five".