919981055 has 16 divisors (see below), whose sum is σ = 1288535040. Its totient is φ = 617420832.

The previous prime is 919981019. The next prime is 919981057. The reversal of 919981055 is 550189919.

It is not a de Polignac number, because 919981055 - 2¹⁰ = 919980031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919981057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277985 + ... + 281274.

It is an arithmetic number, because the mean of its divisors is an integer number (80533440).

Almost surely, 2^919981055 is an apocalyptic number.

919981055 is a deficient number, since it is larger than the sum of its proper divisors (368553985).

919981055 is a wasteful number, since it uses less digits than its factorization.

919981055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559318.

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 919981055 is about 30331.1894755217. The cubic root of 919981055 is about 972.5821501965.

The spelling of 919981055 in words is "nine hundred nineteen million, nine hundred eighty-one thousand, fifty-five".