213731045 has 16 divisors (see below), whose sum is σ = 280264320. Its totient is φ = 155179200.

The previous prime is 213731041. The next prime is 213731047. The reversal of 213731045 is 540137312.

It is not a de Polignac number, because 213731045 - 2² = 213731041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213731041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33416 + ... + 39294.

It is an arithmetic number, because the mean of its divisors is an integer number (17516520).

Almost surely, 2^213731045 is an apocalyptic number.

It is an amenable number.

213731045 is a deficient number, since it is larger than the sum of its proper divisors (66533275).

213731045 is a wasteful number, since it uses less digits than its factorization.

213731045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 213731045 is about 14619.5432555193. The cubic root of 213731045 is about 597.8917163175.

Adding to 213731045 its reverse (540137312), we get a palindrome (753868357).

The spelling of 213731045 in words is "two hundred thirteen million, seven hundred thirty-one thousand, forty-five".