2202001981 has 2 divisors, whose sum is σ = 2202001982. Its totient is φ = 2202001980.

The previous prime is 2202001961. The next prime is 2202002009. The reversal of 2202001981 is 1891002022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2184066756 + 17935225 = 46734^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2202001981 - 2¹³ = 2201993789 is a prime.

It is a super-2 number, since 2×2202001981² = 9697625448655848722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2202001961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1101000990 + 1101000991.

It is an arithmetic number, because the mean of its divisors is an integer number (1101000991).

Almost surely, 2^2202001981 is an apocalyptic number.

It is an amenable number.

2202001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2202001981 is an equidigital number, since it uses as much as digits as its factorization.

2202001981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2202001981 is about 46925.4939345341. The cubic root of 2202001981 is about 1300.9858362400.

The spelling of 2202001981 in words is "two billion, two hundred two million, one thousand, nine hundred eighty-one".