2171054981 has 2 divisors, whose sum is σ = 2171054982. Its totient is φ = 2171054980.

The previous prime is 2171054971. The next prime is 2171055109. The reversal of 2171054981 is 1894501712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1837408225 + 333646756 = 42865^2 + 18266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171054981 - 2⁶ = 2171054917 is a prime.

It is a super-2 number, since 2×2171054981² = 9426959461049820722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171054971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085527490 + 1085527491.

It is an arithmetic number, because the mean of its divisors is an integer number (1085527491).

Almost surely, 2^2171054981 is an apocalyptic number.

It is an amenable number.

2171054981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171054981 is an equidigital number, since it uses as much as digits as its factorization.

2171054981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 2171054981 is about 46594.5810261236. The cubic root of 2171054981 is about 1294.8623619016.

The spelling of 2171054981 in words is "two billion, one hundred seventy-one million, fifty-four thousand, nine hundred eighty-one".