155597201 has 2 divisors, whose sum is σ = 155597202. Its totient is φ = 155597200.

The previous prime is 155597191. The next prime is 155597227. The reversal of 155597201 is 102795551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141729025 + 13868176 = 11905^2 + 3724^2 .

It is an emirp because it is prime and its reverse (102795551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155597201 - 2²² = 151402897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155597291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77798600 + 77798601.

It is an arithmetic number, because the mean of its divisors is an integer number (77798601).

Almost surely, 2^155597201 is an apocalyptic number.

It is an amenable number.

155597201 is a deficient number, since it is larger than the sum of its proper divisors (1).

155597201 is an equidigital number, since it uses as much as digits as its factorization.

155597201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 155597201 is about 12473.8607094997. The cubic root of 155597201 is about 537.8575386446.

The spelling of 155597201 in words is "one hundred fifty-five million, five hundred ninety-seven thousand, two hundred one".