155315617 has 2 divisors, whose sum is σ = 155315618. Its totient is φ = 155315616.

The previous prime is 155315597. The next prime is 155315627. The reversal of 155315617 is 716513551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85359121 + 69956496 = 9239^2 + 8364^2 .

It is a cyclic number.

It is not a de Polignac number, because 155315617 - 2²³ = 146927009 is a prime.

It is not a weakly prime, because it can be changed into another prime (155315627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77657808 + 77657809.

It is an arithmetic number, because the mean of its divisors is an integer number (77657809).

Almost surely, 2^155315617 is an apocalyptic number.

It is an amenable number.

155315617 is a deficient number, since it is larger than the sum of its proper divisors (1).

155315617 is an equidigital number, since it uses as much as digits as its factorization.

155315617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15750, while the sum is 34.

The square root of 155315617 is about 12462.5686357187. The cubic root of 155315617 is about 537.5328894243.

The spelling of 155315617 in words is "one hundred fifty-five million, three hundred fifteen thousand, six hundred seventeen".