902216981 has 2 divisors, whose sum is σ = 902216982. Its totient is φ = 902216980.

The previous prime is 902216947. The next prime is 902217007. The reversal of 902216981 is 189612209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705964900 + 196252081 = 26570^2 + 14009^2 .

It is an emirp because it is prime and its reverse (189612209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 902216981 - 2¹⁴ = 902200597 is a prime.

It is a super-2 number, since 2×902216981² = 1627990961609508722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_46116848 and since 902216981 and 46116848 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (902216681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451108490 + 451108491.

It is an arithmetic number, because the mean of its divisors is an integer number (451108491).

Almost surely, 2^902216981 is an apocalyptic number.

It is an amenable number.

902216981 is a deficient number, since it is larger than the sum of its proper divisors (1).

902216981 is an equidigital number, since it uses as much as digits as its factorization.

902216981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 902216981 is about 30036.9269566645. The cubic root of 902216981 is about 966.2815018177.

The spelling of 902216981 in words is "nine hundred two million, two hundred sixteen thousand, nine hundred eighty-one".