2516222981 has 2 divisors, whose sum is σ = 2516222982. Its totient is φ = 2516222980.

The previous prime is 2516222957. The next prime is 2516222983. The reversal of 2516222981 is 1892226152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2242022500 + 274200481 = 47350^2 + 16559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516222981 - 2²² = 2512028677 is a prime.

It is a super-2 number, since 2×2516222981² = 12662756180225052722, which contains 22 as substring.

Together with 2516222983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2516222983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258111490 + 1258111491.

It is an arithmetic number, because the mean of its divisors is an integer number (1258111491).

Almost surely, 2^2516222981 is an apocalyptic number.

It is an amenable number.

2516222981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516222981 is an equidigital number, since it uses as much as digits as its factorization.

2516222981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 2516222981 is about 50161.9674753692. The cubic root of 2516222981 is about 1360.1382106150.

The spelling of 2516222981 in words is "two billion, five hundred sixteen million, two hundred twenty-two thousand, nine hundred eighty-one".