155105623 has 2 divisors, whose sum is σ = 155105624. Its totient is φ = 155105622.

The previous prime is 155105579. The next prime is 155105647. The reversal of 155105623 is 326501551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155105623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155105591 and 155105600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155105663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77552811 + 77552812.

It is an arithmetic number, because the mean of its divisors is an integer number (77552812).

Almost surely, 2^155105623 is an apocalyptic number.

155105623 is a deficient number, since it is larger than the sum of its proper divisors (1).

155105623 is an equidigital number, since it uses as much as digits as its factorization.

155105623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 155105623 is about 12454.1407973413. The cubic root of 155105623 is about 537.2905236008.

The spelling of 155105623 in words is "one hundred fifty-five million, one hundred five thousand, six hundred twenty-three".