402135451 has 2 divisors, whose sum is σ = 402135452. Its totient is φ = 402135450.

The previous prime is 402135449. The next prime is 402135469. The reversal of 402135451 is 154531204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402135451 - 2¹ = 402135449 is a prime.

Together with 402135449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (402136451) 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, 201067725 + 201067726.

It is an arithmetic number, because the mean of its divisors is an integer number (201067726).

Almost surely, 2^402135451 is an apocalyptic number.

402135451 is a deficient number, since it is larger than the sum of its proper divisors (1).

402135451 is an equidigital number, since it uses as much as digits as its factorization.

402135451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 402135451 is about 20053.3152122037. The cubic root of 402135451 is about 738.1151514513.

Adding to 402135451 its reverse (154531204), we get a palindrome (556666655).

The spelling of 402135451 in words is "four hundred two million, one hundred thirty-five thousand, four hundred fifty-one".