155605001 has 2 divisors, whose sum is σ = 155605002. Its totient is φ = 155605000.

The previous prime is 155604989. The next prime is 155605031. The reversal of 155605001 is 100506551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155027401 + 577600 = 12451^2 + 760^2 .

It is an emirp because it is prime and its reverse (100506551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155605001 - 2⁶ = 155604937 is a prime.

It is not a weakly prime, because it can be changed into another prime (155605031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77802500 + 77802501.

It is an arithmetic number, because the mean of its divisors is an integer number (77802501).

Almost surely, 2^155605001 is an apocalyptic number.

It is an amenable number.

155605001 is a deficient number, since it is larger than the sum of its proper divisors (1).

155605001 is an equidigital number, since it uses as much as digits as its factorization.

155605001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155605001 is about 12474.1733593854. The cubic root of 155605001 is about 537.8665259929.

The spelling of 155605001 in words is "one hundred fifty-five million, six hundred five thousand, one".