2154704681 has 2 divisors, whose sum is σ = 2154704682. Its totient is φ = 2154704680.

The previous prime is 2154704597. The next prime is 2154704683. The reversal of 2154704681 is 1864074512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180266025 + 974438656 = 34355^2 + 31216^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154704681 - 2¹⁴ = 2154688297 is a prime.

It is a super-2 number, since 2×2154704681² = 9285504524646623522, which contains 22 as substring.

Together with 2154704683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2154704683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077352340 + 1077352341.

It is an arithmetic number, because the mean of its divisors is an integer number (1077352341).

Almost surely, 2^2154704681 is an apocalyptic number.

It is an amenable number.

2154704681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154704681 is an equidigital number, since it uses as much as digits as its factorization.

2154704681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 2154704681 is about 46418.7966345531. The cubic root of 2154704681 is about 1291.6036145390.

The spelling of 2154704681 in words is "two billion, one hundred fifty-four million, seven hundred four thousand, six hundred eighty-one".