2154045241981 has 2 divisors, whose sum is σ = 2154045241982. Its totient is φ = 2154045241980.

The previous prime is 2154045241969. The next prime is 2154045241993. The reversal of 2154045241981 is 1891425404512.

It is a balanced prime because it is at equal distance from previous prime (2154045241969) and next prime (2154045241993).

It can be written as a sum of positive squares in only one way, i.e., 2151015289956 + 3029952025 = 1466634^2 + 55045^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154045241981 - 2⁵ = 2154045241949 is a prime.

It is a super-2 number, since 2×2154045241981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154045241961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077022620990 + 1077022620991.

It is an arithmetic number, because the mean of its divisors is an integer number (1077022620991).

Almost surely, 2^{2154045241981} is an apocalyptic number.

It is an amenable number.

2154045241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154045241981 is an equidigital number, since it uses as much as digits as its factorization.

2154045241981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 2154045241981 in words is "two trillion, one hundred fifty-four billion, forty-five million, two hundred forty-one thousand, nine hundred eighty-one".