213631442 has 8 divisors (see below), whose sum is σ = 323751036. Its totient is φ = 105714432.

The previous prime is 213631423. The next prime is 213631489. The reversal of 213631442 is 244136312.

It can be written as a sum of positive squares in 2 ways, for example, as 187936681 + 25694761 = 13709^2 + 5069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550403 + ... + 550790.

Almost surely, 2^213631442 is an apocalyptic number.

213631442 is a deficient number, since it is larger than the sum of its proper divisors (110119594).

213631442 is a wasteful number, since it uses less digits than its factorization.

213631442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101292.

The product of its digits is 3456, while the sum is 26.

The square root of 213631442 is about 14616.1363567805. The cubic root of 213631442 is about 597.7988253326.

Adding to 213631442 its reverse (244136312), we get a palindrome (457767754).

The spelling of 213631442 in words is "two hundred thirteen million, six hundred thirty-one thousand, four hundred forty-two".