402132281 has 2 divisors, whose sum is σ = 402132282. Its totient is φ = 402132280.

The previous prime is 402132197. The next prime is 402132301. The reversal of 402132281 is 182231204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391406656 + 10725625 = 19784^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 402132281 - 2²² = 397937977 is a prime.

It is a super-2 number, since 2×402132281² = 323420742844525922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (402135281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201066140 + 201066141.

It is an arithmetic number, because the mean of its divisors is an integer number (201066141).

Almost surely, 2^402132281 is an apocalyptic number.

It is an amenable number.

402132281 is a deficient number, since it is larger than the sum of its proper divisors (1).

402132281 is an equidigital number, since it uses as much as digits as its factorization.

402132281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 402132281 is about 20053.2361727478. The cubic root of 402132281 is about 738.1132119463.

Adding to 402132281 its reverse (182231204), we get a palindrome (584363485).

The spelling of 402132281 in words is "four hundred two million, one hundred thirty-two thousand, two hundred eighty-one".