155541257 has 2 divisors, whose sum is σ = 155541258. Its totient is φ = 155541256.

The previous prime is 155541251. The next prime is 155541259. The reversal of 155541257 is 752145551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136913401 + 18627856 = 11701^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 155541257 - 2⁴ = 155541241 is a prime.

Together with 155541259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155541251) 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, 77770628 + 77770629.

It is an arithmetic number, because the mean of its divisors is an integer number (77770629).

Almost surely, 2^155541257 is an apocalyptic number.

It is an amenable number.

155541257 is a deficient number, since it is larger than the sum of its proper divisors (1).

155541257 is an equidigital number, since it uses as much as digits as its factorization.

155541257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35000, while the sum is 35.

The square root of 155541257 is about 12471.6180586161. The cubic root of 155541257 is about 537.7930698134.

The spelling of 155541257 in words is "one hundred fifty-five million, five hundred forty-one thousand, two hundred fifty-seven".