220670981 has 2 divisors, whose sum is σ = 220670982. Its totient is φ = 220670980.

The previous prime is 220670963. The next prime is 220671029. The reversal of 220670981 is 189076022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132480100 + 88190881 = 11510^2 + 9391^2 .

It is a cyclic number.

It is not a de Polignac number, because 220670981 - 2¹⁰ = 220669957 is a prime.

It is a super-2 number, since 2×220670981² = 97391363711004722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220670951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110335490 + 110335491.

It is an arithmetic number, because the mean of its divisors is an integer number (110335491).

Almost surely, 2^220670981 is an apocalyptic number.

It is an amenable number.

220670981 is a deficient number, since it is larger than the sum of its proper divisors (1).

220670981 is an equidigital number, since it uses as much as digits as its factorization.

220670981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 220670981 is about 14854.9985190171. The cubic root of 220670981 is about 604.2941758449.

The spelling of 220670981 in words is "two hundred twenty million, six hundred seventy thousand, nine hundred eighty-one".