155381983 has 2 divisors, whose sum is σ = 155381984. Its totient is φ = 155381982.

The previous prime is 155381929. The next prime is 155382001. The reversal of 155381983 is 389183551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155381983 - 2¹³ = 155373791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155387983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77690991 + 77690992.

It is an arithmetic number, because the mean of its divisors is an integer number (77690992).

Almost surely, 2^155381983 is an apocalyptic number.

155381983 is a deficient number, since it is larger than the sum of its proper divisors (1).

155381983 is an equidigital number, since it uses as much as digits as its factorization.

155381983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 155381983 is about 12465.2309645670. The cubic root of 155381983 is about 537.6094407042.

The spelling of 155381983 in words is "one hundred fifty-five million, three hundred eighty-one thousand, nine hundred eighty-three".