155143979 has 8 divisors (see below), whose sum is σ = 156933120. Its totient is φ = 153360000.

The previous prime is 155143909. The next prime is 155144051. The reversal of 155143979 is 979341551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155143979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155143909) 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 7 ways as a sum of consecutive naturals, for example, 120662 + ... + 121940.

It is an arithmetic number, because the mean of its divisors is an integer number (19616640).

Almost surely, 2^155143979 is an apocalyptic number.

155143979 is a deficient number, since it is larger than the sum of its proper divisors (1789141).

155143979 is a wasteful number, since it uses less digits than its factorization.

155143979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581.

The product of its digits is 170100, while the sum is 44.

The square root of 155143979 is about 12455.6805916016. The cubic root of 155143979 is about 537.3348087282.

The spelling of 155143979 in words is "one hundred fifty-five million, one hundred forty-three thousand, nine hundred seventy-nine".