213731746 has 4 divisors (see below), whose sum is σ = 320597622. Its totient is φ = 106865872.

The previous prime is 213731719. The next prime is 213731747. The reversal of 213731746 is 647137312.

213731746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 91872225 = 11039^2 + 9585^2 .

It is not an unprimeable number, because it can be changed into a prime (213731747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53432935 + ... + 53432938.

Almost surely, 2^213731746 is an apocalyptic number.

213731746 is a deficient number, since it is larger than the sum of its proper divisors (106865876).

213731746 is a wasteful number, since it uses less digits than its factorization.

213731746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106865875.

The product of its digits is 21168, while the sum is 34.

The square root of 213731746 is about 14619.5672302569. The cubic root of 213731746 is about 597.8923699764.

The spelling of 213731746 in words is "two hundred thirteen million, seven hundred thirty-one thousand, seven hundred forty-six".