155841979 has 2 divisors, whose sum is σ = 155841980. Its totient is φ = 155841978.

The previous prime is 155841967. The next prime is 155842003. The reversal of 155841979 is 979148551.

It is a weak prime.

It is an emirp because it is prime and its reverse (979148551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155841979 - 2⁹ = 155841467 is a prime.

It is not a weakly prime, because it can be changed into another prime (155841919) 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, 77920989 + 77920990.

It is an arithmetic number, because the mean of its divisors is an integer number (77920990).

Almost surely, 2^155841979 is an apocalyptic number.

155841979 is a deficient number, since it is larger than the sum of its proper divisors (1).

155841979 is an equidigital number, since it uses as much as digits as its factorization.

155841979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 49.

The square root of 155841979 is about 12483.6684912729. The cubic root of 155841979 is about 538.1394347068.

The spelling of 155841979 in words is "one hundred fifty-five million, eight hundred forty-one thousand, nine hundred seventy-nine".