2081121431 has 4 divisors (see below), whose sum is σ = 2100571272. Its totient is φ = 2061671592.

The previous prime is 2081121407. The next prime is 2081121457. The reversal of 2081121431 is 1341211802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081121431 is a prime.

It is a super-2 number, since 2×2081121431² = 8662132821134975522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2081121397 and 2081121406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081121401) 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, 9724760 + ... + 9724973.

It is an arithmetic number, because the mean of its divisors is an integer number (525142818).

Almost surely, 2^2081121431 is an apocalyptic number.

2081121431 is a deficient number, since it is larger than the sum of its proper divisors (19449841).

2081121431 is a wasteful number, since it uses less digits than its factorization.

2081121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19449840.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2081121431 is about 45619.3098479142. The cubic root of 2081121431 is about 1276.7302268308.

The spelling of 2081121431 in words is "two billion, eighty-one million, one hundred twenty-one thousand, four hundred thirty-one".