402555281 has 2 divisors, whose sum is σ = 402555282. Its totient is φ = 402555280.

The previous prime is 402555233. The next prime is 402555341. The reversal of 402555281 is 182555204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254689681 + 147865600 = 15959^2 + 12160^2 .

It is a cyclic number.

It is not a de Polignac number, because 402555281 - 2¹⁴ = 402538897 is a prime.

It is a super-2 number, since 2×402555281² = 324101508521977922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (432555281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201277640 + 201277641.

It is an arithmetic number, because the mean of its divisors is an integer number (201277641).

Almost surely, 2^402555281 is an apocalyptic number.

It is an amenable number.

402555281 is a deficient number, since it is larger than the sum of its proper divisors (1).

402555281 is an equidigital number, since it uses as much as digits as its factorization.

402555281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 402555281 is about 20063.7803267480. The cubic root of 402555281 is about 738.3719265473.

The spelling of 402555281 in words is "four hundred two million, five hundred fifty-five thousand, two hundred eighty-one".