402135523 has 2 divisors, whose sum is σ = 402135524. Its totient is φ = 402135522.

The previous prime is 402135497. The next prime is 402135533. The reversal of 402135523 is 325531204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402135523 - 2²¹ = 400038371 is a prime.

It is not a weakly prime, because it can be changed into another prime (402135533) 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, 201067761 + 201067762.

It is an arithmetic number, because the mean of its divisors is an integer number (201067762).

Almost surely, 2^402135523 is an apocalyptic number.

402135523 is a deficient number, since it is larger than the sum of its proper divisors (1).

402135523 is an equidigital number, since it uses as much as digits as its factorization.

402135523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 402135523 is about 20053.3170074180. The cubic root of 402135523 is about 738.1151955030.

Adding to 402135523 its reverse (325531204), we get a palindrome (727666727).

The spelling of 402135523 in words is "four hundred two million, one hundred thirty-five thousand, five hundred twenty-three".