155331889 has 2 divisors, whose sum is σ = 155331890. Its totient is φ = 155331888.

The previous prime is 155331887. The next prime is 155331937. The reversal of 155331889 is 988133551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136773025 + 18558864 = 11695^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 155331889 - 2¹ = 155331887 is a prime.

Together with 155331887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155331881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77665944 + 77665945.

It is an arithmetic number, because the mean of its divisors is an integer number (77665945).

Almost surely, 2^155331889 is an apocalyptic number.

It is an amenable number.

155331889 is a deficient number, since it is larger than the sum of its proper divisors (1).

155331889 is an equidigital number, since it uses as much as digits as its factorization.

155331889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 155331889 is about 12463.2214535408. The cubic root of 155331889 is about 537.5516607277.

The spelling of 155331889 in words is "one hundred fifty-five million, three hundred thirty-one thousand, eight hundred eighty-nine".