231402135 has 64 divisors (see below), whose sum is σ = 399015936. Its totient is φ = 114307200.

The previous prime is 231402131. The next prime is 231402151. The reversal of 231402135 is 531204132.

231402135 = 345² + 346² + ... + 902².

It is not a de Polignac number, because 231402135 - 2² = 231402131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231402131) 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 in 63 ways as a sum of consecutive naturals, for example, 1419564 + ... + 1419726.

It is an arithmetic number, because the mean of its divisors is an integer number (6234624).

Almost surely, 2^231402135 is an apocalyptic number.

231402135 is a deficient number, since it is larger than the sum of its proper divisors (167613801).

231402135 is a wasteful number, since it uses less digits than its factorization.

231402135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 231402135 is about 15211.9076712949. The cubic root of 231402135 is about 613.9350861711.

Adding to 231402135 its reverse (531204132), we get a palindrome (762606267).

The spelling of 231402135 in words is "two hundred thirty-one million, four hundred two thousand, one hundred thirty-five".