213504457 has 4 divisors (see below), whose sum is σ = 214864516. Its totient is φ = 212144400.

The previous prime is 213504449. The next prime is 213504491. The reversal of 213504457 is 754405312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 95043001 + 118461456 = 9749^2 + 10884^2 .

It is a cyclic number.

It is not a de Polignac number, because 213504457 - 2³ = 213504449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213504407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679794 + ... + 680107.

It is an arithmetic number, because the mean of its divisors is an integer number (53716129).

Almost surely, 2^213504457 is an apocalyptic number.

It is an amenable number.

213504457 is a deficient number, since it is larger than the sum of its proper divisors (1360059).

213504457 is a wasteful number, since it uses less digits than its factorization.

213504457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360058.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 213504457 is about 14611.7917108067. The cubic root of 213504457 is about 597.6803556776.

Adding to 213504457 its reverse (754405312), we get a palindrome (967909769).

The spelling of 213504457 in words is "two hundred thirteen million, five hundred four thousand, four hundred fifty-seven".