155240017 has 2 divisors, whose sum is σ = 155240018. Its totient is φ = 155240016.

The previous prime is 155240011. The next prime is 155240053. The reversal of 155240017 is 710042551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101525776 + 53714241 = 10076^2 + 7329^2 .

It is a cyclic number.

It is not a de Polignac number, because 155240017 - 2¹¹ = 155237969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155239973 and 155240000.

It is not a weakly prime, because it can be changed into another prime (155240011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77620008 + 77620009.

It is an arithmetic number, because the mean of its divisors is an integer number (77620009).

Almost surely, 2^155240017 is an apocalyptic number.

It is an amenable number.

155240017 is a deficient number, since it is larger than the sum of its proper divisors (1).

155240017 is an equidigital number, since it uses as much as digits as its factorization.

155240017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 155240017 is about 12459.5351839465. The cubic root of 155240017 is about 537.4456604161.

Adding to 155240017 its reverse (710042551), we get a palindrome (865282568).

The spelling of 155240017 in words is "one hundred fifty-five million, two hundred forty thousand, seventeen".