2148352981 has 4 divisors (see below), whose sum is σ = 2148537312. Its totient is φ = 2148168652.

The previous prime is 2148352957. The next prime is 2148353023. The reversal of 2148352981 is 1892538412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2148352981 - 2⁷ = 2148352853 is a prime.

It is a super-2 number, since 2×2148352981² = 9230841061943172722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2148352931) 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, 73411 + ... + 98416.

It is an arithmetic number, because the mean of its divisors is an integer number (537134328).

Almost surely, 2^2148352981 is an apocalyptic number.

It is an amenable number.

2148352981 is a deficient number, since it is larger than the sum of its proper divisors (184331).

2148352981 is a wasteful number, since it uses less digits than its factorization.

2148352981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184330.

The product of its digits is 138240, while the sum is 43.

The square root of 2148352981 is about 46350.3288122102. The cubic root of 2148352981 is about 1290.3332234134. Note that the first 3 decimals are identical.

The spelling of 2148352981 in words is "two billion, one hundred forty-eight million, three hundred fifty-two thousand, nine hundred eighty-one".