155145889 has 2 divisors, whose sum is σ = 155145890. Its totient is φ = 155145888.

The previous prime is 155145877. The next prime is 155145901. The reversal of 155145889 is 988541551.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (155145877) and next prime (155145901).

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 11505664 = 11985^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 155145889 - 2⁵ = 155145857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155145589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77572944 + 77572945.

It is an arithmetic number, because the mean of its divisors is an integer number (77572945).

Almost surely, 2^155145889 is an apocalyptic number.

It is an amenable number.

155145889 is a deficient number, since it is larger than the sum of its proper divisors (1).

155145889 is an equidigital number, since it uses as much as digits as its factorization.

155145889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288000, while the sum is 46.

The square root of 155145889 is about 12455.7572632097. The cubic root of 155145889 is about 537.3370137880.

The spelling of 155145889 in words is "one hundred fifty-five million, one hundred forty-five thousand, eight hundred eighty-nine".