155145857 has 2 divisors, whose sum is σ = 155145858. Its totient is φ = 155145856.

The previous prime is 155145821. The next prime is 155145871. The reversal of 155145857 is 758541551.

155145857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148815601 + 6330256 = 12199^2 + 2516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155145857 is a prime.

It is not a weakly prime, because it can be changed into another prime (155145877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77572928 + 77572929.

It is an arithmetic number, because the mean of its divisors is an integer number (77572929).

Almost surely, 2^155145857 is an apocalyptic number.

It is an amenable number.

155145857 is a deficient number, since it is larger than the sum of its proper divisors (1).

155145857 is an equidigital number, since it uses as much as digits as its factorization.

155145857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140000, while the sum is 41.

The square root of 155145857 is about 12455.7559786630. The cubic root of 155145857 is about 537.3369768447.

The spelling of 155145857 in words is "one hundred fifty-five million, one hundred forty-five thousand, eight hundred fifty-seven".