155131087 has 2 divisors, whose sum is σ = 155131088. Its totient is φ = 155131086.

The previous prime is 155131049. The next prime is 155131127. The reversal of 155131087 is 780131551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155131087 - 2²⁷ = 20913359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155131007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77565543 + 77565544.

It is an arithmetic number, because the mean of its divisors is an integer number (77565544).

Almost surely, 2^155131087 is an apocalyptic number.

155131087 is a deficient number, since it is larger than the sum of its proper divisors (1).

155131087 is an equidigital number, since it uses as much as digits as its factorization.

155131087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 155131087 is about 12455.1630659739. The cubic root of 155131087 is about 537.3199246781.

The spelling of 155131087 in words is "one hundred fifty-five million, one hundred thirty-one thousand, eighty-seven".