402202981 has 2 divisors, whose sum is σ = 402202982. Its totient is φ = 402202980.

The previous prime is 402202979. The next prime is 402202993. The reversal of 402202981 is 189202204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400600225 + 1602756 = 20015^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 402202981 - 2¹ = 402202979 is a prime.

It is a super-2 number, since 2×402202981² = 323534475850572722, which contains 22 as substring.

Together with 402202979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402202921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201101490 + 201101491.

It is an arithmetic number, because the mean of its divisors is an integer number (201101491).

Almost surely, 2^402202981 is an apocalyptic number.

It is an amenable number.

402202981 is a deficient number, since it is larger than the sum of its proper divisors (1).

402202981 is an equidigital number, since it uses as much as digits as its factorization.

402202981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 402202981 is about 20054.9989030167. The cubic root of 402202981 is about 738.1564659936.

The spelling of 402202981 in words is "four hundred two million, two hundred two thousand, nine hundred eighty-one".