155019983 has 2 divisors, whose sum is σ = 155019984. Its totient is φ = 155019982.

The previous prime is 155019979. The next prime is 155019989. The reversal of 155019983 is 389910551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155019983 - 2² = 155019979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155019983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155019989) 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, 77509991 + 77509992.

It is an arithmetic number, because the mean of its divisors is an integer number (77509992).

Almost surely, 2^155019983 is an apocalyptic number.

155019983 is a deficient number, since it is larger than the sum of its proper divisors (1).

155019983 is an equidigital number, since it uses as much as digits as its factorization.

155019983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 155019983 is about 12450.7021087166. The cubic root of 155019983 is about 537.1916188871.

The spelling of 155019983 in words is "one hundred fifty-five million, nineteen thousand, nine hundred eighty-three".