921801055 has 16 divisors (see below), whose sum is σ = 1330721280. Its totient is φ = 598823712.

The previous prime is 921801031. The next prime is 921801059. The reversal of 921801055 is 550108129.

It is a cyclic number.

It is not a de Polignac number, because 921801055 - 2⁹ = 921800543 is a prime.

It is a super-2 number, since 2×921801055² = 1699434369998226050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921801059) 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, 692419 + ... + 693748.

It is an arithmetic number, because the mean of its divisors is an integer number (83170080).

Almost surely, 2^921801055 is an apocalyptic number.

921801055 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

921801055 is a deficient number, since it is larger than the sum of its proper divisors (408920225).

921801055 is a wasteful number, since it uses less digits than its factorization.

921801055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386198.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 921801055 is about 30361.1767723190. The cubic root of 921801055 is about 973.2230813408.

The spelling of 921801055 in words is "nine hundred twenty-one million, eight hundred one thousand, fifty-five".