1555117 has 2 divisors, whose sum is σ = 1555118. Its totient is φ = 1555116.

The previous prime is 1555111. The next prime is 1555123. The reversal of 1555117 is 7115551.

It is a balanced prime because it is at equal distance from previous prime (1555111) and next prime (1555123).

It can be written as a sum of positive squares in only one way, i.e., 1552516 + 2601 = 1246^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555117 - 2⁷ = 1554989 is a prime.

1555117 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1555091 and 1555100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777558 + 777559.

It is an arithmetic number, because the mean of its divisors is an integer number (777559).

2^1555117 is an apocalyptic number.

It is an amenable number.

1555117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555117 is an equidigital number, since it uses as much as digits as its factorization.

1555117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 875, while the sum is 25.

The square root of 1555117 is about 1247.0433031776. The cubic root of 1555117 is about 115.8566650147.

The spelling of 1555117 in words is "one million, five hundred fifty-five thousand, one hundred seventeen".