2155521983 has 4 divisors (see below), whose sum is σ = 2155614960. Its totient is φ = 2155429008.

The previous prime is 2155521971. The next prime is 2155522001. The reversal of 2155521983 is 3891255512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2155521983 - 2⁸ = 2155521727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155521983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155581983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19691 + ... + 68547.

It is an arithmetic number, because the mean of its divisors is an integer number (538903740).

Almost surely, 2^2155521983 is an apocalyptic number.

2155521983 is a deficient number, since it is larger than the sum of its proper divisors (92977).

2155521983 is an equidigital number, since it uses as much as digits as its factorization.

2155521983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92976.

The product of its digits is 108000, while the sum is 41.

The square root of 2155521983 is about 46427.5993671868. The cubic root of 2155521983 is about 1291.7669001444.

The spelling of 2155521983 in words is "two billion, one hundred fifty-five million, five hundred twenty-one thousand, nine hundred eighty-three".