155143987 has 4 divisors (see below), whose sum is σ = 163309480. Its totient is φ = 146978496.

The previous prime is 155143909. The next prime is 155144051. The reversal of 155143987 is 789341551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789341551 = 449 ⋅1757999.

It is a cyclic number.

It is not a de Polignac number, because 155143987 - 2²³ = 146755379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155143187) 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 in 3 ways as a sum of consecutive naturals, for example, 4082718 + ... + 4082755.

It is an arithmetic number, because the mean of its divisors is an integer number (40827370).

Almost surely, 2^155143987 is an apocalyptic number.

155143987 is a deficient number, since it is larger than the sum of its proper divisors (8165493).

155143987 is an equidigital number, since it uses as much as digits as its factorization.

155143987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165492.

The product of its digits is 151200, while the sum is 43.

The square root of 155143987 is about 12455.6809127402. The cubic root of 155143987 is about 537.3348179640.

The spelling of 155143987 in words is "one hundred fifty-five million, one hundred forty-three thousand, nine hundred eighty-seven".